what bad service

I have had problems with my iPhone 6 plus since I got the phone now when I I send it in you want to charge me R7000 to repair! ! those is unacceptable this has been the worst iPhone ever . I moved all my contracts from Vodafone to mtn who do.i move to now !!! should have bought the phone from the istore as they said they would have helped me if the phone was not a mtn phone what bull is that. my next email is going to be to apple themselves. mtn has given me the worst service ever!!!! always tell everyone mtn is he best network but now I have to think again !!!! I can't believe how bad it have been treated! !!!!