Bad service

The service I've been getting has been bad so far. I have a problem where I've been registered for 16 modules when I'm suppose to do 8 modules according to my qualification. I'm an online student and I'm expected to pay more than R48 000 because of this mistake. I've went on campus, made calls and locked tickets for nearly a month and the problem with my modules still hasn't been fixed, as well as my statement. I called this one time and the lines were busy. They said they are going to get back to me and they never did. Now I'm expected to pay more than I must for my tuition fee.