What to Do When a Bill Is Wrong

This is less a set of instructions about disputing a bill than an argument, and it is worth saying so at the start.

Check the obvious causes first

The most common cause of an unexpectedly large bill is a run of estimated readings followed by an actual one. The second most common is a tariff ending, since default rates are typically higher than the deal that expired.

The third is a genuine change in consumption, whether a cold winter, a new appliance or a leak on a metered water supply. Check the readings on the bill against the meter itself, and check the meter serial number matches the one on the bill. Working through those four checks resolves a substantial proportion of disputes before any contact is needed.

Assemble the evidence

Gather the account number, the bill in question, your own meter readings with dates, and any relevant photographs. Compare the same period a year earlier, since a like-for-like comparison is far more persuasive than an assertion that it seems high. Write down the timeline of what happened and when, because a clear sequence is what allows somebody to find the error.

Cooking for one, if a previous conversation took place, note the date and what was agreed, and ask for it to be confirmed in writing. Evidence assembled first makes the first contact the last contact, which is the entire objective.

Making the first contact count

State what you believe is wrong, what the correct figure should be and what you are asking them to do. Attach the evidence rather than describing it, and keep the message factual rather than expressing how the situation feels.

Ask for a correction and a corrected bill, which is a specific action, rather than for the matter to be looked into. Use written channels where possible, since a written record is what any later escalation will rely on. Note the reference number for the case, because without it every subsequent contact starts from nothing.

Escalating properly

Most providers have a formal complaints procedure that is distinct from ordinary customer service, and it usually has a deadline. Ask explicitly for the complaint to be raised formally, since informal contact often does not start the clock. Keep every response, and note when the provider's stated deadline expires.

Many regulated sectors, including energy, water, telecoms and financial services, have an ombudsman you can approach afterwards, usually free of charge.

Which schemes exist depends entirely on the country and the sector, so check your national regulator's website for the route that applies.

Paying while disputing

Withholding the entire payment can put you in arrears, which weakens your position and may trigger recovery action. The common approach is to pay the undisputed portion and clearly identify the amount in dispute in writing. In several sectors a provider should not pursue recovery on an amount under formal dispute, though this varies by country.

In a small flat, never cancel a payment authority as a negotiating tactic, since the debt remains and the escalation accelerates. If you genuinely cannot pay, say so early, because most providers have arrangements that are far easier to access before arrears build.

Leave gas, mains electrics and anything behind a wall to someone qualified and insured.

Preventing the next one

Submit meter readings on a regular date so estimates never accumulate into a large correction. Diarise the end date of every fixed-term contract, since rolling onto a default rate is the single most common avoidable increase.

Check each bill briefly when it arrives rather than filing it, which catches errors when they are one month old rather than nine. Keep readings and bills together for at least a year so comparison is possible without reconstructing anything. Backbilling limits exist in some countries, restricting how far back a supplier may charge for unbilled consumption, and they are worth knowing about.

The takeaway

Check the readings, gather the evidence, write once with everything attached, and escalate on their own timetable.

A home that works is a set of small systems, not one big clean.