I’m not so sure about this. I probably should clarify this:
They were supposed to collect a DD of £65, but collected £130 instead. (No-one that I spoke to from Economy Energy - and I spoke to 5 different people - could explain why they had done so.) The only option I have when putting in an indemnity claim is to return the full payment.
However, as per the agreement I should’ve paid £65, so there would indeed be a “missed payment” somewhere if I return the full payment, despite me being in credit with them. As such I think they would probably be technically correct in reporting this to the CRA.