Absolutely shocking service from MTN

I cancelled a contract with MTN that expired at the end of Jan 2023, with them according to their policy 30 days prior to the expiration of the contract. I received a reference number to confirm this cancellation. By the end of April I was still being charged for this contract. I phoned the call centre to sort this out, was on the line for over an hour, told that the contract is still open, and although they can see the reference number to cancell it, it is still open. I was put through to 5 different departments, each department asking me to redo my security checks and tell my story all over. Nobody could assist, the last department I was in fact put though to was retentions! By this stage I was at my wits end. I asked for a number to call to speak to somebody directly, and was told to dial 808. When in fact I dialed 808, there is no such number in existance. Today, two weeks later, I phoned again to try and resolve the problem, only to be told that my contract is still active, and that I need to speak to cancellations, which is only open in the week. I asked to be transferred to a supervisor, as I wished the supervor to escalate this problem to canccellations. I was put on hold for 30 minutes, and then cut off. This is absolutely unacceptable, I have nobody who is prepared to assist me with my problem. Each department shifts me onto another.