Contract cancellation

I have two contracts with Telkom and the other one expired, I called them two months back to cancel the month to month one and the lady confirmed that I must pay for it then the following month it won't be existing, the following month I was still billed while the contract was terminated, I called them but I could not get hold of their billing team as it looked like their cancellation team did not convey the cancellation to the other team, I logged tickets online but still no response or call on this matter, today I went to their store but they could not assist but to put me on a call with the billing team. The lady I spoke with said she was checking why I was still being billed and ended up dropping the call, I asked the lady at the store to log a request but I was told they don't do that in store they only focus on sales, horrible service from Telkom I wouldn't wish anyone to consider them as they always have stories.