Hi andybell,
I hope you don't mind me popping on to this thread.
The process is, when you change supplier, approach your chosen supplier and they will advise us that your leaving.
Then at the final stage of the transfer, your new supplier will ask you, for your start readings, as soon as they get them they will then send them to us.
We will end your account on those readings, and send you a final bill, as your on a prepayment meter you might owe us a little for standing charge.
It's not good that we kept sending you bills but, I think we kept changing the readings that's what it sounds like, as I cannot not be sure as I haven't looked at your account.
If your not happy with the offer EON has offered, you need to escalate it to follow our complaint procedure.
I hope you get it sorted just shout up if you need anything else.
Amy