Debit order

2022 October I've changed my banking details and I immediately informed telkom with ne details as I have contract phones with them....

End October they used old account which I understood, end November they debited on my old account when I enquire was informed that that my bank account must be 3 months older, so I had to pay a penalty because there was no money on my old account even though I paid at shoprite before the month end.

December I went to pay at shoprite again early before the debit on my old account as I new that I don't have funds, same thing happened on the 29th of December again they went to debit on my old account and they have added penalty that I don't have money on my account.

January I went to one of their branches zevenvacht in kuilsriver cape town for the verification as my banking account is more than a month, little did I know Is that they couldn't manage to verify me and lodge a case which was not the fist time till today nothing has happen from their side. I need to know what must I do in order for them to debit on my new bank account as I have tried to reached with them through calls and visiting different branches with no luck

In dec