Dstv unauthorized deduction from bank account

At the beginning of September I cancelled my dstv subscription, the service was paid up until the 25th September and dstv duly disconnected the device the 15th, in the 16th September thsy debited my bank account fir R919 for a new month, I spoke to the call centre and they confirmed it will be refunded in 3 to 4 days, after 4 days I called again as I have not received my refund, I was told it was still with management for approval and she would escalate it, yesterday I called again as I still haven't gotten my refund and the agent said she couldn't see when it will be done. I just want my money back, this is blant *****, I want my money back you *******.