Lacking support on services I pay for.

I have been a client with Nedbank for many years, have several accounts, credit cards, a personal loan and my vehicle is financed through MFC, etc. I opened a business account for my wife's school and part of the account is a free payroll software that we can use. I have however been struggling with my local branch for months now, but still nobody could help me set it up and get it to work. I have made several calls and sent several emails and I received one of two phone calls back with promises of help that will be given, but all empty promises. What must I do to get the support I need ?