Contract not cancelled and still being billed

On the 28 Aug 2015, I went to the Telkom branch in Fourways to cancel my contract. I was informed that my contract was going to expire on the 1st September, so as such, I would need to complete the cancellation form to finalise this cancellation. <br> <br> Then I received a deduction from my bank account, on the 1st September. Went back to the branch to open up a case, and they said the call centre would contact me. Just last week (26 Nov) I received a SMS says my case had been closed. I have continued to receive deductions off my account. <br> <br> I called the call centre today, they said my contract was cancelled on the 18th November. I received the last bill on the 1st December. <br> <br> Please assist.