No replay - No service

I got a bill last month of R7003 and when I phoned in I was informed that I went over my data limit on my one contract. Normally MTN sends me a sms to notify me that I went over my data limit and will be charged for the amount of data which I'm using from that moment on. The person helping me from MTN Customer services logged the situation and told me that they would come back to me to inform me to whats happening. It has been over two weeks now and there has been no replay to inform me to whats going on. <br> <br> From last year when I took out my contract I had to phone in for MTN to reconnect my data contract, that happend every 1-2 months. They have told me a few times that I have to phone in so that they can increase my credit limit, I have tried that as well and still nothing happened. <br> <br> So basically I am paying for a service that I do not get, or get a replay from. I have the reference number from my last call to mtn. This is not the first time I had problems with mtn.