MTN - Hell No!

I have changed banking details with MTN, they failed to update this even after receiving sufficient notice. Two months later and this is not updated, I have made a manual payment on 1 October 2024 and they have not allocated this to my account despite my sending proof of payment and receiving variance reference numbers. When calling to follow up I get told they cannot assist they need to refer it and I cannot get an email address to follow up to get an update I need to keep calling in.