Dstv deliberately overcharging me

I called multichoice in June 2018 asking them to upgrade my dstv bouquet, and for some reason, the call center agent made an error by subscribing to a wrong bouquet and immiduetly rectified the error according to her. But ever since then, my service gets cut almost weekly and the reason I am always given is that I owe multichoice and everytime I have to explain myself and my services would then be restored. So far, I called the company more than 5 times ( almost weekly since june) to ask them to restore my service and as mentioned, explain myself over and over again over something that was caused by theirs employee. And all of them when I call, they acknowledge when checking the system that the error was on their site. I loss airtime every time I call them