Seriously bad service from MTN and their consultants do not have any clue!!!

I received a zero balance statement last month with a credit displayed for the amount of R 1 843-11. Then received a message from MTN that the exact amount was outstanding. I contacted MTN quering this message and outstanding amount. I was passed through 4 different consultants and not one of them could assist with the matter. I was promised that my line would not be disconnected until the query was resolved, but the next day my account was suspended. I contacted MTN again to speak to a manager just to be told that they are unavailable and they would contact me. Seriously unimpressed with their services seeing that I have been a MTN customer since +-1995 and am considering cancelling my contract with MTN.