DSTV Account Problem

I have a problem with my dstv account, I have been charged for times at my holiday home, which I asked for my decoder to be switched of after a couple of day, DSTV did not disconnect and then my account just went up, I also have been billed incorrectly and frequently for months on end, when I called to activate my decoder again the consultant would advise me that my decoder was never switched or disconnected after the days I asked for it to be on,