MTN contract cancellation

I had a contract with MTN. I misses one payment but payed it after my lone was cut off. A week later my line was cut again, i submitted proof of payment and thought all was sorted all of a sudden R820 was debited from my account, I called several times and none of the consultants could tell me as to why the debit order date changed and why I was over charged.

After having issues with this I decided to cancel my contracts. I called Dec 2020 I was given the early cancellation fee and called to cancel. I called again and I was told both my contracts are cancelled.

2022 January I get an SMS that i have been creduted with data, I have been calling but put on hold for more than 20min. I have called 5 times but I cannot through to the cancellation department for them to do what they were supposed to do in December.