Over charge on 2 year contract

<p>Debit orders still goes through my account eventhough I have paid for my explorer in full, for the past 3 months I've been phoning the accounts department and for 3 months I'm told that they offline they will contact me as soon as the system is back on (I have not received any call!!!!). The consultant acknowlaged that she can see that the account is paid in full but can't do anything.</p> <p> </p>