Poor service from MTN

Good I have been trying to cancel my month to month subscription, however it seems to be impossible. I have already handed the device back to MTN on the 28th of February 2024 at the waterfall mall branch and have received the IRMS no. *** from the person working in the store. ( Christo Venter ) The contacts person at Waterfall mall MTN (Christo Venter) assured me that the cancellation cannot be done from his end and that the onus will be on me to cancell my contact via the cancellation department on MTN no. 135. When using this route it takes an average of two hours and multiple attempts to get through to the retention department. Once getting hold of them I am told that the only way to cancell the contract is to do it in store. I am trying to cancell month to month internet contract on NO. ***8 but that seems to be impossible.. MTN is still deducting the fees every month