I CAN NOT USE ANY MTN SERVICES

It's been months now experiencing problems with MTN South Africa. I can't make calls, can't check my balance, can't even send a please me callback message to people who can still use their phones because they are getting a better service from other networks unlike me. A few months back, while I could still use my phone to call I called the @MTN Service Centre and I was told I am on the priority list. I called again I was told the same thing. I took this to Hellopeter.com and I got a very nice message that my complaint will be attended. Even worse now, I can't call MTN to complain about their ****py service