Dissapointed customer

My contract ended in January 2021 and MTN converted it to a month to month contract. I called and cancelled the contract and was assured no more debits would go through my account as everything was settled. To my surprise, my account was debited the following month, I called again and was told it was the outstanding amount from the month to month of which I was not informed of. I called MTN again and requested the recording of my cancellation where I was assured that my account will not be debited, I was told the recording would be sent to an MTN outlet of my choosing. I went to an MTN outlet ( College square, Bloemfontein) with The ref. nr and was told that they were offline and that they would call me back with the recording once they were back on. It has been two weeks and still nothing. I want to be contact by the MTN SA HQ and be reimbursed of the debit that was made on my account and also cancel my remaining contracts with them with immediate effect. I am utterly disappointed by the service received especially for a long standing customer of MTN myself.