Neidio i’r llywio Neidio i’r cynnwys Neidio i’r troedyn

Letter to complain about energy back-billing

This advice applies to Cymru

If you haven't had an energy bill in over a year, your supplier has to follow certain rules about how far back they bill you.

You should first read our guidance if you've not received a bill in a while.

If your supplier tries to bill you for more than they should, you can use this example letter to help you write a complaint. 

If you need more detailed advice and guidance, contact the Citizens Advice Consumer Helpline.

A oedd y cyngor hwn yn fuddiol?
Pam nad oedd y cyngor yn fuddiol?
A oedd y cyngor hwn yn fuddiol?

Diolch i chi, cyflwynwyd eich adborth.