Beyond bad mtn

Hi I had a contact for data with mtn for every 2 years for 6 years, in November last year I canceled my contract because I got a better deal with supersonic, after numerous calls because they don't answer the phone, the manager at campus Square branch also requested a cancelation for my account because I was very frustrated with there terrible service, I also e-mailed a cancelation to mtn. Yet every month they are billing me almost R4000. 00 for a service that I do not use, I even put a stop order with the bank but the debit order still goes through, I am beyond fed up with this blatant *****ing of my money, our country has lost its customer service, mtn is the biggest ***** in history, I am absolutely livid and a taking them to the consumer council, because I believe that I'm not the only person, other people are having the same problem with mtn, a bunch of *********, my account number for billing is sp ba ***. Please South Africa boycott bad, terrible, extremely poor and really horrible mtn