MTN stinks!

I think MTN must be the worst company when it comes to customer service. On the 8th March some guy called me to change my contract to give me more data or something. I asked repeatedly what it would cost me and I was old over and over again - NO EXTRA CHARGE. On my next account there was an additional charge of R200. I called immediately to cancel and revert to my original plan which suited me very well. Since then my service has been suspended. I have paid my usual amount every month, but NOTHING has been done, even though I have spoken to about 20 people at MTN. Each and every one promises to sort things out, but they do nothing. I don't know where to turn now, as I have been without a phone for months. There is never a manager to talk to - they are always out and will call me back, but never do. It is always somebody else's fault, and nobody there has any idea of what to do. All I want is my old service back and for them to credit my account with the R200 they **** about. And when they read this - if they ever bother about their customers - they will do NOTHING! AS USUAL! I wish I could cancel my contract and tell them to take a hike, but my contract has a long way to go. I have been an MTN customer since the beginning of cell phones - many years. This service is despicable!