Incompetant and non service for business client

I have been trying to speak to someone at the Centurion branch to find out which documents are required to change the directors on a business bank account. This seems to be a simple request, but since there is now no business manager or branch manager at this branch, no one seems to care or know what to do! The service at the Centurion branch, where my account has been for more than 15 years are disgraceful. In fact there is just no service at all.