Billed incorrectly and services terminated

I have been trying for the past two months to get my account reconciled and fixed because I have two decoders and some idiot in the call centre in Johannesburg made it worse. When I called the call centre on 11July 2015 the consultant who assisted me continued to place charges on my account after I had already finished talking to him on the phone. My account was charged with R425 every 30 sec which eventually amounted to R3445. When I call in again a few days later, my account was R858 which I paid. I viewed my account again yesterday because I want to upgrade back to premium, my account was on R1200. I called in and asked to speak to the call centre supervisor and was assured that he would call me back. No one has called me yet and this matter needs to be resolved asap.