MTN has **** and ****** from me

I have been forced into a contract I did not agree to and more importantly have not signed! My contract was ready for an upgrade and after disgussing options telephonically with mtn my contract was changed and my father was billed!!! I did not agree to anything and as the account holder my father did not agree or sign anything. I am suppose to be taking over a new contract that I will pay for and simply keep my number (which iv had for 12 years.) How is this acceptable mtn... guess my father and i are simply more long term customers you are happy to loose. I have tried repeatedly to resolve this issue and spend hours on the phone to be pushed around in circles and stone walled. How can they treat their customers so disgustinly and then take money and edit our accounts with out permission? Help please.