Multichoice really poor customer service

So I received my new DSTV decoder (new price lock contract) last year round about August 2017 while still on the last few months of my current price lock. When DSTV called me to ask If I will upgrade I said yes and specifically asked the lady that called If I will be double debited very month and she confirmed and said no. I will only be billed for the new contract once the old one comes to an end. Well the first month after receiving this new contract I got double billed. After numerous debit order reversals and only paying what is due, after numerous calls to the call center, after numerous service suspensions every month after numerous promises and escalations that this matter will be resolved, I am still being double debited. After every call I was promised that a supervisor would call me to resolve the matter and up till today, no phone call. This is utterly pathetic service Multichoice. How difficult can it really be to resolve this matter. I have told your agents everytime that if this matter does not get resolved I will take it a step further and I am hoping you will call me now to resolve this matter. And please do not apologise for your pathetic customer service....