Quick summary: Wrong energy supplier, failed switch or billing issue? Learn which meter readings, bills, switch emails and complaint replies can help.
Keep switch confirmation and dates
Save the switch request, welcome email, cancellation messages, cooling-off information and the date each supplier says responsibility changed.
Preserve meter readings and bills
Keep opening and closing readings, smart meter screenshots, estimated bills, final bills and any revised bill issued later.
Separate supplier and broker evidence
If a comparison site, broker or third party was involved, keep their messages separately from supplier bills and complaint replies.
Track complaint responses
Keep acknowledgements, deadlock letters, final responses and Ombudsman information in date order.
Evidence checklist
- Switch request and welcome emails
- Opening and closing meter readings
- Old and new supplier bills
- Broker or comparison site messages
- Complaint and final response letters
- Evidence of extra costs or missed credits
Common questions
What if I was switched without consent?
Keep any message showing you did not request the switch, plus bills, account numbers and supplier responses from both companies.
Are meter readings important?
Yes. Opening, closing and disputed readings often decide whether the bill is accurate and which supplier is responsible.
What if both suppliers blame each other?
Keep both sets of replies and build a single timeline showing who said what and when. This helps identify the unresolved point.
Should I keep estimated bills?
Yes. Estimated bills, revised bills and final bills help show how the amount changed and whether corrections were applied properly.
Can the Energy Ombudsman be relevant?
It may be relevant after the supplier has had time to respond or issued a deadlock letter. Keep final responses and complaint dates.