Unhelpful and *****ing Money

I created my application and made payment, my payment is linked to my application but I cannot schedule an appointment. I have contacted VFS many times by phone and email and suggested it is perhaps a problem for their technical department but I have received NO RESPONSE and NO SOLUTION.

VFS is making it incredibly difficult to renew my visa within South Africa which is my right and further they are *****ing my money because a refund is not any easier