Bad Service

I had a contract with MTN. For almost 10 months my debit order was not going off. Nobody ever contacted me to inform me. Each month I still received my airtime and sms's and then in July I get a sms out of the blue that I owe over R3000. Why didn't MTN contact me sooner? My services were then disconnected. I tried numerouse time to phone the call centre but I was unable to get through. Then I finally got through to a call centre agent and I was informed that my account is with the legal department. I asked to be transfered and got disconnected 3 times and then I phoned another 3 times to get the telephone number of the legal department and 3 times it was the incorrect telephone number. I have also sent many emails and nobody is getting back to me. I'm upset that nobody ever contacted me to tell me my debit order is not delivering and then all of a sudden I owe this huge amount. I'm upset that I cannot get service when I try to contact MTN. I'm upset that I have to spend all this time making an effort to speak to sombody. I was a client for almost 10 years and I am very disappointed. What is going on MTN? You are stressing me out!