Billing Disputes and Overcharging

Billing disputes arise in many contexts:

• Utility bills: Incorrect meter readings, estimated bills significantly higher than actual usage, charges for a period after you moved out, or back-billing for more than the allowed period (12 months for energy)
• Telecoms: Mid-contract price increases above what was contracted, charges for services not used or not provided, early termination fees on contracts you are legally entitled to exit
• Financial services: Bank charges, unfair overdraft fees, payment processing errors, incorrect interest calculations
• Retail and services: Being charged the wrong price, being billed twice, or being charged for cancelled orders
• Professional services: Invoices above agreed quotes, charges for work not authorised, or billing for time not actually spent

When you identify an incorrect charge:

1. Act immediately: Contact the company as soon as you spot the error. Note the date, the reference number, and what you were told.
2. Put it in writing: Follow up any phone call with an email confirming the dispute. State the specific charge you are disputing, the correct amount you believe is owed, and the evidence supporting your position.
3. Withhold only the disputed portion: Pay the undisputed part of the bill on time. Withhold only the amount you genuinely dispute — withholding a full bill you partially agree with may put you in breach of contract.
4. Request a full explanation: Ask the company to explain in writing how the charge was calculated and under which contract term it is permitted.

If you have already paid an overcharge:

• Write to the company requesting a refund of the specific overpayment, with reasons
• For credit or debit card payments, ask your card provider about a chargeback if the company refuses
• For regulated sectors, escalate to the relevant ombudsman (FOS for financial firms, Energy Ombudsman for energy, CISAS for telecoms)
• For smaller amounts, the small claims process is straightforward — you can issue a claim for money owed (a simple debt claim)

Claims for overpayments are subject to the general six-year limitation period for contract claims, so do not delay if significant amounts are involved.

Energy suppliers are bound by the back-billing rule: they cannot charge you for energy used more than 12 months ago if the delay in billing was their fault. This applies to both gas and electricity and is enforced by Ofgem. If your supplier sends you a catch-up bill covering more than 12 months, challenge it immediately citing the back-billing principle. The supplier must write off any charges older than 12 months.

For water and telecoms, different rules apply. Water companies can back-bill for up to 6 years under the Limitation Act 1980. Telecoms providers can also back-bill for past usage, though most voluntarily limit this. If you receive any unexpected back-bill, check whether the provider caused the delay (for example, by failing to read your meter or send bills). If the delay was their fault, you have stronger grounds to dispute or negotiate. Always request a payment plan if you cannot pay a large catch-up bill in one go — suppliers must offer reasonable arrangements.

Billing disputes are among the most common consumer complaints in the UK, but many people do not know their full range of rights — particularly around mid-contract price increases, the specific ombudsman routes available for different sectors, and the Equality Act protections that apply to billing practices.

Mid-contract price increases in telecoms: Telecoms providers have increasingly used mid-contract inflation-linked price increases, often well above headline inflation. Ofcom's rules on mid-contract price rises were updated in 2024, requiring providers to state clearly at the point of sale whether the contract price will increase and by how much. If your provider introduces a price increase that was not clearly disclosed at the point of sale, you may have the right to exit the contract without paying early termination charges. Check your contract terms and Ofcom's guidance. If you believe a price increase was not properly disclosed, raise a complaint with your provider and escalate to the relevant ADR scheme (CISAS or Ombudsman Services: Communications) if unresolved.

Financial Ombudsman Service for billing disputes: The FOS handles billing disputes with banks and financial services firms — including bank charges, credit card interest errors, payment processing mistakes, and overdraft fee disputes. The FOS can award compensation and direct the firm to correct billing errors. There is no upper limit on the amount the FOS can consider for individual complaints (though the binding award limit is £415,000). To use the FOS: complain formally to the firm first; if unresolved after 8 weeks (or if you receive a final response you are unhappy with), refer to the FOS online. There is no charge to consumers.

Energy Ombudsman for billing disputes: The Energy Ombudsman resolves billing disputes with gas and electricity suppliers that have not been resolved through the supplier's own process. Common energy billing disputes include: estimated bills that are much higher than actual consumption; charges after a switch that was not properly executed; exit fee disputes; and catch-up bills that breach the 12-month back-billing rule. After raising a formal complaint with the supplier, if unresolved after 8 weeks (or a deadlock letter issued sooner), refer to the Energy Ombudsman at energyombudsman.org. Awards are binding on the supplier if you accept them.

Equality Act 2010 and discriminatory billing: Billing practices must comply with the Equality Act 2010. Service providers cannot charge higher prices, impose additional charges, or apply different billing terms because of a protected characteristic. If you believe you have been charged more, billed differently, or denied a discount because of your age, disability, race, religion, sex, or another protected characteristic, raise this as part of your formal complaint. Both Trading Standards and the relevant sector regulator can investigate discriminatory billing practices. The Equality Advisory and Support Service (EASS) provides free advice on Equality Act claims in this context.