MTN IS A MESS

My Sony C, bought at American Swiss outlet in Empangeni was freezing and sent it for repairs with MTN in December 2014. Nobody bothered to give me a fault report after I have made a follow up myself after 2months they are sitting with my phone and doing absolutely nothing on it. I was told my cellphone was exposed to a form of liquid, however I am 100% sure it was never ever near any liquid as it was pretty new. Repair center contact number *** is NEVER answered and to add salt in the wound, I am told to fork out R320 at the store to get my phone back. Is that a fair business practice? I am not happy with the response I have received and asked what other options do I have either then legal route. the lady from the call center told me I have to swallow the bullet as hot as it is. I feel they are flouting customer rights and I am proceeding with legal action. MTN is very useless, how can you don't know the address for repair center????