Credit for exit fee

How do I send bill across to claim credit for cancellation/exit fee?

From https://help.bulb.co.uk/hc/en-us/articles/115001227591-What-about-exit-fees-from-my-current-supplier- :

If you leave another supplier with more than 49 days left on a fixed contract, you may be charged an exit fee. But don’t worry, we’ll refund any charges made to you.

All you need to do is email in a copy, photocopy or scan of your final bill to help@bulb.co.uk and we’ll credit your Bulb account on the same day.

Just make sure that the supply address, bill date and exit fee charges are all clearly displayed.