Terminate my contract please

I sent cancellation documents of the 13 of October 2017 to cancel my contract with notice from the 1st of November 2017 till the end of the month. During the month of November i kept calling to check on my cancellation and was told the cancellation department will call me and the consultant la confirmed that they can see my cancellation documents on your system. Toward the end of November no one has called me and I called Telkom again and the consultant just said I must just boycott the SIM card and not use it until Telkom terminates my contract. I haven't used the Telkom sim card to date since the 1st of December. Please cancel my contract - I don't want to deal with Telkom anymore. I am back to using my MTN SIM card.