Poor Contract Cancellation Service

I am very disappointed by the service offered by MTN. Last month I had an issue with the MTN contract, and I wanted to cancel the contract because it had expired. I was told it had an outstanding balance due for payment, which I did pay on the same day at the MTN shop. I tried to call the MTN contract for cancelation and they sent me to legal department because they could not clear some error, and the legal department said all is clear and I must call back the contract department and from then it's been back and forth. A week later I called MTN contract department and was told the same story and I was so ANGRY that how can a simple solution not be resolved. Four weeks later I went to the MTN shop and we called the MTN contract department, guess what!!! same old story from contract department to legal as usual and what frustrates me a lot is I'm being debited every month for a sim card that has not been used for years. MTN has absolutely POOR SERVICE, POOR MANAGEMENT, POOR SYSTEMS AND PLEASE DONT GO THERE.

Contract Number in question: *** My Contact Number: ***