MTN is making it impossible to give notice to CANCEL the END DATED contract

I have been trying to give notice to cancel this contract with end date 26th Dec 2022 since 16th October 2022 telephonically, via email with no reply from the retention/cancellation department. MTN is making it impossible to give notice to CANCEL the contract which has an end date! It seems this is a ploy to continue charging clients and make it impossible to cancel their end dated contracts. Ref ***N*** ( I was told by Rily that this is the ref no) I called on the 25th Nov 2022 to give notice to cancel the contract on its end date the 26th Dec 2022. I was told that MTN was not processing ANY CANCELLATIONS and that all customers who called in to cancel contracts would be called back on Monday to process their cancellations by a manager Rily at 11:45 pm to 12 pm call duration 21min 44s. On the 26th Nov 2022 the retentions/cancellation department was closed. On the 28th Nov 2022 I called since 9:12AM to 9:58AM trying to give notice to cancel the contract but was informed that MTN was not processing ANY CANCELLATIONS because their system is under construction and to call back on the 5th Dec 2022. I asked to speak to the manager who told me otherwise on the 25th and he was apparently in a meeting.