MTN Refuse to update Banking details

I have changed bank accounts in April 2020. At first my bank tried to move my debit order to my new bank account, mtn ofcourse refused and said I have to do it myself. I went to the store, they noted they can’t do it in store. I logged a query on customer care in May, took them a week to respond. In the meantime I called them spoke to a lady to change the details she ended up blocking my account because she was incapable of typing the one time pin I gave her, no supervisor around to unblock it ofcourse. I then logged another query via email and continuing with the old query providing on both queries my stamped letter of the bank. No response.

I called again spoke to another lady she said she managed to change it yet again 1 June it went off from the wrong bank account. I emailed again MTN confirmed they have changed it, the second time I received confirmation it has been changed. 1 July it went off again from the wrong account. They said i have to send my bank statement to escalate because on the system it shows its been updated, they never responded. 1 Aug went off from the wrong bank account. Called again spoke to a lady she updated and confirmed it is updated. MTN responded on the email saying case closed without ever checking if it has been resolved.

1 September went off again on the wrong bank account.

I will be closing the bank account and dare blacklist me, I have to pay excessive banking fees just for my MTN debit order to go off. it has been almost 6 months of encountering with MTN to change my bank account it has been infuriating and it’s the most pathetic service I have ever received, i will NEVER take a contract with MTN again not recommended them to anyone It’s pathetic to say the least.