DSTV, what a circus.

I cancelled my online stream8ng acount in beginning off desember. The cut of date was the 19th of desember. The 19th of desember my dstv was switched off and could not use it anymore but they still took a payment from me on the 20th of desember. When I contact them via phone or live chat they give me a refference number and tell me that they escalated the matter and that someone will contact me as soon as possible to arrange a refund. Im still waiting. Sick and tired of the bad service of dstv. What should I do next?