unable to resolve ********** transaction

hi<br> in 2008 I report that my credit transaction made to book AVIS car was **********, I call them and I was told to destroy the card and send them Affidavit which I did that.My credit card was a student card with a limit of R500 but they managed to pay AVIS an amount of over R3000. I was told that they will do the investigation but haven't received any feedback and instead no the account has been handed over the Attorneys. I have been calling and sending emails to the lawyers explaining to them but till today I have not being helped instead they send me email demanding the money. I have notice that last year they did credit check on me and I also called complaining but still nothing. I have been making payment in previous years so that it does not affect my credit records with a hope that this will be resolved and I will get my refund. Is this how Nedbank treat clients and when I called Nedbank legal department I get Voicemail which I left message but still no respond