No integrity. Cannot even process a cancellation!

I called to cancel my contract in September, a month before it was due to expire. MTN is STILL debiting my account and can't tell mr why the cancellation was not processed. Spoke to Natasha, Saturday 2 January 2021, who assured me my refund would be processed in 3 business days. Has not happened. The cancellation has still not been processed. I want to end my relationship with this awful company already!