Unpleasant customer service

Im not happy with the service I got from Telkom mobile store from VAAL MALL, The service there is pathetic. Iv CANCELLED my CONTRACT with them last year but they still debit my account, I went to the store to do that but I was not helped they told me that they had emailed my CANCELLATION FORM but if they had done a follow-up I believe I wouldn't even hv to write this about them, I went back there to tell them that im still being debited but they just told me that I need to do it myself which I told them THAT I've already tried, they then told me that there is nothing they can do from thier side, I mean they were able to help me to sign up a CONTRACT with them, so why can't they CANCEL IT. I've also contacted them telling them my concerns still today I've not been helped, I've even decided to reverse the debit orders for January and February as my CONTRACT with them ended in DECEMBER 2017. And yes I did submit the CANCELLATION FORM in time. Please telkom mobile YOU need to do something about your service from your staff.