Incorrect Billing and botched contract cancellation

In November 2023, MTN Billed me incorrectly. 1st Dec 2023, I then requested a correction (***), however no correction was made to date.

I subsequently (on 1 Dec 2023) requested that one of my contracts be cancelled as it was on a month to month basis, only to get billed for the contract in December 2023. I followed up with MTN and was told that my request for a cancellation does not reflect on the system. To make matters worse,I requested a recording of the call I made on the 1st December 2023 and still to date I have no recording.

I have been a customer since 1999 and I must say MTN service has deteriorated over the years.

I want my billing sorted ASAP.