MNT Retensions Department

Morning I have been try since last year to cancel a contract with MTN that was due to expire on the 3 March 2021. The Retensions department is to busy to take calls. It makes it impossible to even speak to anyone to cancel your contract. You can not cancel your contract via email due to security reasons. You are on hold for an hour, 40 min. etc. in 1 day to try and speak to anyone. I complained on Facebook Messenger and got a response very quick and on the 3 March '21 I was contacted via Messenger to assist to cancel my contract and was told it will take 2-24 hours for feedback. Today is the 10 March '21 and still no feedback. When I phoned the MTN this morning I was told the contract has not been cancelled. The department that deals with cancellations are open from 8am to 5pm (I think) and from Monday to Friday. I get the response from MTN that the department is very buys and receives alot of calls. They make it impossible to cancel a contract you no longer want or want or cant not pay for. No MTN will most possibly tell me that because the contract wasnt cancelled in time, the debit order will still go off end of March etc. This is honestly not my mistake or problem.