Major service failure

I have been trying change my banking details since November and no one is able to help.

I have also called in numerous times and been promised call backs.

I have tried to change the details online but I am not able to do so. They agents advise me to go to a branch but 1. It still would not help as the details I need to update are not an option on Multichoice systems. 2, I do not have time to run around to a branch which is why I am phoning and trying to use digital channels,