[lostandconfused]

i think what has probably happened is your account was closed down and any amount that you overpaid was refunded to you.
then after all that has happened the retentions department would have put a debit on the account with the remainder of the contract.
if you move adress to a non servicable are you are still liable for the contract, however as it can be proved that it was agreed that you wouldnt have to pay these charges (as the account was fully settled and then the debit was added) i cant see why anyone wont remove them for you.
hopefully the forum team will sort for you asap