Billing disputes

First: identify which part of the bill is wrong

Ofcom’s billing rules: accuracy is not optional

Ofcom General Condition C3 is designed to ensure customers are not overcharged and receive the services they are charged for. It also contains requirements around billing information and treatment where bills are unpaid. Large providers can also be subject to metering and billing approval requirements.

Citing C3 can be useful, but the strongest complaint still identifies the actual numerical error. “Your bill breaches Ofcom rules” is less effective than showing that the agreed £28 monthly price became £41, the £8 discount disappeared in month four, and the provider cannot identify a contractual change authorising it.

Wrong tariff or monthly price

Put the sales record beside the bill. Check the advertised price, personalised contract information/summary, minimum term, annual price-change clause where relevant, add-ons and any introductory period. Providers sometimes investigate only the tariff currently loaded on the account rather than what was actually agreed.

If the system record conflicts with the order confirmation or sales evidence, ask the provider to resolve the evidential conflict rather than treating its live billing code as conclusive.

Discounts that disappear

Discount disputes are often evidential. Record whether the discount was contractual, promotional, discretionary goodwill or conditional on another service. A promise such as “£5 off for 18 months” is different from a one-off £5 credit.

Ask for the account’s full adjustment/discount history and the reason code for removal. If the provider says the discount “expired”, require it to identify where that expiry was disclosed. If it says the promise was never made, preserve or request the sales call, chat or contemporaneous order notes.

Usage disputes

For disputed calls, data or messages, ask for an itemised record sufficient to identify the charge: date, time, destination/category, quantity and tariff applied. Then separate “I did not make this usage” from “I made it but the price is wrong”. Those are different investigations.

For data usage, device logs can help but may not perfectly match network metering. Focus on significant inconsistencies, impossible timings, allowance application and whether the provider gave required spend/usage information.

Roaming charges

Roaming disputes can involve the roaming zone, network registration, fair-use rules, roaming passes, bill limits and whether the device connected near a border or through a maritime or satellite network. Providers must publish roaming charges and, when you enter another country, normally send an automatic message explaining relevant roaming charges or usage limits unless you have opted out.

Preserve those welcome texts, screenshots of roaming settings, purchase confirmations for passes or add-ons, and device/network usage records. Ask the provider to identify the network, country or zone, chargeable sessions, tariff applied, and any warning or cap that should have operated. If the underlying usage happened but the provider failed to apply an agreed pass, limit or tariff, frame that as the actual billing error.

Premium-rate and third-party charges

A bill can include phone-paid or premium-rate services supplied by a third party. Ofcom took over day-to-day regulation of phone-paid services in February 2025. The network should be able to identify the service provider and explain why the charge appeared on the bill, but a dispute about the underlying phone-paid service or refund will often need to be raised with that service provider first.

Do not accept “it is a third-party charge” as the end of the investigation. Ask for the number or shortcode, provider identity, timestamps, amount, authorisation trail and the route for stopping further charges. Separate a network billing-record error from a dispute about consent, transparency or the service supplied by the phone-paid provider.

Early termination charges

An early termination charge should be traceable to the contract, remaining minimum term and provider calculation. Check whether the service had already reached minimum term, whether a switch/cancellation right arose, whether the provider itself breached the contract, and whether any price-change rules are relevant.

Ask for the calculation line by line. A single figure labelled “termination fee” is not enough to test whether the amount is correct.

Device finance, handset agreements and SIM-only obligations

Modern mobile arrangements can contain separate service and device obligations. A handset loan may be regulated credit while the airtime contract is an electronic communications service. Cancelling one does not necessarily cancel the other, and a billing complaint about airtime should not be allowed to obscure a separate credit balance.

Collect both agreements. Identify which entity is creditor, which charges are service charges, whether device payments continue after airtime cancellation and which complaint/ombudsman jurisdiction applies to each element.

Credits promised but never applied

Keep every credit promise with date, amount and reason. Then request the account ledger so you can see whether the credit was actually posted, reversed or absorbed by another balance. Providers sometimes say “the credit is on the account” without showing its effect on the running balance.

A useful schedule has four columns: date, charge, payment/credit, running balance. Once reconciled, most arguments become much clearer.

Billing after cancellation or switching

Where charges continue after you believe the service ended, identify the exact cancellation/switch event and effective termination date. Check notice periods, equipment return requirements, final usage and any separately continuing device agreement.

Do not simply dispute every post-cancellation line. A final bill can legitimately include charges accrued before termination. Challenge the lines that depend on service continuing after the contractual end date or on an incorrect termination fee.

Collections while the amount is disputed

There is no universal rule that saying “I dispute this bill” automatically suspends every collection step. That is why the complaint should expressly ask the provider to mark the amount as disputed, prevent avoidable collection escalation while it investigates, and explain what it will do with the undisputed part.

Where affordable and tactically sensible, continuing to pay the amount you genuinely accept can help demonstrate that the dispute concerns a defined sum rather than refusal to pay the account. Make clear that any payment is not acceptance of the disputed portion.

Credit-file reporting during a billing dispute

A billing dispute and credit-data dispute can overlap but are not identical. If the provider reports arrears/default information, check whether the reported balance, status and dates accurately reflect what happened. The existence of a complaint does not automatically make accurate negative information unlawful, but an unresolved factual error should not simply be repeated to the CRAs.

Raise the underlying billing complaint and, where necessary, a separate accuracy/credit-reporting challenge. Keep screenshots from all three CRAs if the entries differ.

When “the system says you owe it” is not an investigation

Billing systems are evidence, not infallible adjudicators. A proper response should reconcile the charge against the contract, usage or account event that generated it. Ask for the underlying ledger and event data rather than another screenshot of the same disputed total.

If the provider changes its explanation, for example from usage to termination charge to device balance: record those contradictions. They can show that the complaint has not been properly scoped or investigated.

Evidence: build a billing reconciliation, not a document dump

A simple reconciliation method

Common provider responses, and what to ask next

Start with the contract summary and contract information

For residential customers and small businesses with ten employees or fewer, Ofcom's contract rules require key information before the customer is bound, including charges, contract length and cancellation information. A short contract summary should also be provided before consent. These documents are often the best starting point for a billing dispute because they show what price and structure the provider said you were agreeing to.

Compare the contract summary, detailed contract information, order confirmation and first bill. If the provider relies on a term that does not appear in the documents you were given, ask it to identify when and how that term was communicated before you became bound.

Price rises: check when the contract was entered

For new contracts entered from 17 January 2025, Ofcom prohibits inflation-linked or percentage-based price-rise terms for the core subscription price. Where a provider includes an in-contract rise, the amount must be set out clearly and prominently in pounds and pence before the customer signs up, together with when it will occur.

Older contracts can still require different analysis. If a provider raises a price that was not specified in the contract, or goes beyond the specified increase, Ofcom's rules can require notice and a right to leave without penalty depending on the change. Keep the date of contract formation and the original price-rise wording: applying today's rule to a pre-17-January-2025 contract can produce the wrong answer.

Itemised billing: make the provider show its workings

Ofcom's billing protections require customers to have access to adequate, up-to-date billing information, and bills must be accurate. Where the dispute concerns calls, data, roaming or premium-rate usage, ask for itemisation sufficient to identify the date, time, destination/category, volume and charge that make up the disputed amount.

A total such as “£186 additional usage” is not a meaningful investigation. Reconcile the itemised records against handset logs, roaming messages, account settings and the tariff allowance. If the provider says itemisation cannot be supplied, ask what underlying metering record it relied on to bill you.

One wrong bill can create several later errors

A billing dispute often snowballs. An incorrect charge increases the balance; the balance triggers a failed Direct Debit or restriction; a late-payment fee is added; collections start; the provider then reports arrears or a default. Treat those as linked consequences but identify each one separately.

Your remedy may therefore need more than “refund £40”. Ask for the originating billing error to be corrected, consequential fees removed, the account ledger rebuilt, collections recalled where appropriate, and inaccurate credit reporting corrected. A £40 credit that leaves a false arrears marker behind has not necessarily put the consumer back into the correct position.

Paying the undisputed amount

Where possible, separate what you accept from what you dispute. Continuing to pay the undisputed monthly service amount can prevent the argument becoming “customer stopped paying everything”, while you challenge the specific excess. If the provider's systems do not let you allocate payment cleanly, tell it in writing what the payment represents.

Do not assume withholding the whole bill automatically protects your position. Equally, paying a disputed amount to avoid restriction or adverse reporting does not necessarily mean you accepted that it was valid: state that the payment is made under protest and continue the complaint if necessary.

Direct Debit refunds do not decide the underlying bill

If a Direct Debit was collected incorrectly, the Direct Debit Guarantee may provide a bank-side refund for an error in the collection. But recovering the debit does not automatically extinguish a genuine contractual debt to the telecom provider. The provider can still pursue an amount that is actually owed.

Use the Guarantee to correct the payment error, then resolve the billing liability separately. Otherwise the customer can receive the money back from the bank but immediately face collections because the provider still believes the invoice is due.

Roaming: reconstruct the timeline

Roaming disputes are rarely resolved by saying “I did not use that much data”. Build a timeline showing when the device entered the country/network, what roaming messages or spending-cap notices arrived, what settings were enabled, which apps used data, and when the charge accrued.

Ask the provider for the underlying usage/session records and the tariff applied. If a cap, block or roaming pass was promised, identify exactly when it should have activated. A handset's data counter can be useful corroboration but may not match the provider's billing period or network measurement exactly, so compare like with like.

Premium-rate and third-party charges

Charges for premium-rate or third-party services can involve a separate service provider as well as the network. Identify the service, number or shortcode, date, amount and regulatory category. The network should still explain why the charge appeared on its bill and what route applies to challenge it.

Do not let the complaint disappear into “contact the third party” without first obtaining the billing evidence and identifying who is responsible for the disputed element. Where a specialist premium-rate complaint route applies, use it alongside any challenge to inaccurate network billing.

Device finance: separate the handset debt from airtime

Many mobile arrangements contain distinct airtime and handset/device obligations. A disputed airtime bill does not automatically invalidate a separate regulated credit agreement; equally, a provider should not merge balances in a way that makes it impossible to see which agreement, charge or default is being pursued.

Ask for a ledger broken down by airtime, device instalments, add-ons, credits, termination charges and payments. If adverse credit reporting follows, check which legal entity and agreement is reporting it. A SIM-only service default and a regulated handset-credit default are not interchangeable simply because both appear under the same brand.

Early termination charges: calculate, do not assume

An early termination charge should be traceable to the contract and the circumstances of termination. Ask the provider to show the minimum term end date, monthly price, discounts or avoided costs used, any separate device balance, and the calculation producing the charge.

Then ask why the contract ended. Cancellation by choice, provider breach, a qualifying detrimental contract change and a switching error can lead to different outcomes. “You left early” is not enough if the dispute is precisely that the provider gave you a right to leave without penalty.

Collections during a live billing dispute

A complaint does not automatically freeze every collection activity, but the provider should not ignore a substantive dispute and continue as though liability has already been conclusively established. Tell the provider which amount is disputed, why, what evidence is outstanding and what you are paying meanwhile.

If the account is sent to a debt collector, send the collector the dispute reference and ask it to return the disputed liability to the provider for investigation where appropriate. Keep the billing complaint and debt-collection conduct as separate issues so each can be assessed properly.

Formal complaint, deadlock and the six-week ADR point

If customer service cannot correct the bill, make a formal complaint and obtain the complaint reference. Ask for a final/deadlock letter if the provider reaches its final position. Since 8 April 2026, unresolved telecom complaints can generally be taken to the provider's approved ADR scheme once six weeks have passed from the formal complaint, rather than the old eight-week threshold.

Check whether the provider belongs to Communications Ombudsman or CISAS. ADR can examine the individual complaint; Ofcom regulates the sector and uses complaints to inform enforcement but does not normally resolve individual billing disputes for consumers.

What to ask for in the remedy

ADR and escalation

Ofcom does not normally decide individual customer billing disputes. Providers must belong to an Ofcom-approved ADR scheme. As of 8 April 2026 the standard waiting period for eligible telecom complaints reduced from eight weeks to six weeks; a deadlock letter can allow earlier referral where the provider says it cannot resolve the complaint.

Check which scheme your provider belongs to: Communications Ombudsman or CISAS, and send a focused chronology, reconciliation and remedy request. If the problem also concerns regulated device credit or data protection, another body such as the Financial Ombudsman or ICO may have a separate role.