Disgusted in Telkom

It is now February and still there is no end to telkom trying to debit my account *******ly. I have no contract with them. The device I sent back on 6th December that was sent to me under false pretenses has clearly still not been rectified. I received an invoice last month stating final invoice of 0.00 and this weekend I have seen a new invoice of over R500 when I HAVE NO ACCOUNT WITH THEM ANYMORE. I am revolted in the fact that nobody seems to do their jobs and nobody EVER bothers to respond and fix the problem!!!