Service disgrace from Apple and Mtn

I had an Apple Iphone 5C on a MTN contract. I had the phone for almost 2 years and the screen started giving problems. I could still hear when notifications came through, I just couldn't see anything due to the screen being dead. I took the Iphone to a MTN store at Cape Gate Shopping centre, Brackenfell on 2 January 2015, 6days before the warranty expired. After various calls and emails, Apple responded that the warranty had expired and it would cost me R3300 to repair the phone. I refused to pay so the sent the phone to MTN head office in Montaque Gardens. MTN asked a service fee of R300 to return my phone to my possesion. And they do not return any calls or emails!<br> This is not the service I expect of big companies such as MTN and Apple. I'm not impressed and want answers, it has been 7months already. What can be done about my situasion? Any advise?