Have requested cancellation in Aug, still not cancelled

I went to a telkom branch to cancel my LTE 50gig and they gave me a cancellation form to say that I need to fill in and email through to **********

I have submitted this on the 24th of Aug, 6th of Sep and 8th of November, and this still has not been cancelled. I have given enough notice as my contract expired beginning of Aug. I did not renew my contract. I have phoned Telkom, and after holding for someone to help me after 40 minutes, they just say they cannot see why it is not cancelled.

The service of Telkom unacceptable, they do not cancel your contract, but you cannot use the internet in the evening as it is to slow