Failed to cancel my contract

I have logged a request for contract cancellation on the 3rd of November at Telkom the Glen Mall where I was assisted by Busi and I got case number ***3. On the 24th November I got an email from Bongumusa Si***ane saying he is trying to contact me I should send him my contact number and I did, he then called me the same day confirming that I want to cancel my contract. On the 3rd of December I got a statement with the bill of the contract that I cancelled, I then called the call centre asking why am I billed for a contract that I cancelled, I was advised that my contract was still not cancelled they will send an email to the cancellation department and they will get back to me but till today no one has. I then decided to follow-up on the 10th December I spoke to Roberta she said she will send an email, samething on the 14th when speaking to Thembi and another call today with Kamogelo, I've been requesting for my contract to be cancelled and for Telkom to take the data that they loaded as I do not need it because I have a new voice & data contract with them.