bad service

I upgraded my handset last year on the 5/9 and never had problems with the phone until the beginning of August 15..the phone kept loosing network every time when I got home until the next morning when I go to work...it wabeyondeveryday thing..I day I decided to go to the store I got my phone from which is MTN and they said it might be a network error in my area and I told them I am not the only one using MTN at home but 2 people also using MTN they suggested I call the network coverage department when I got home and I did so with my brothers phone and the lady I spoke to told me the phone might be @ fault I should take it in for repairs.. I then took my phone back to the store for repairson the 31/08.. On the 16/09 I received an SMS from the repair centre saying my phone is beyond repairs and for dispatch I need to pay R330 for any queries I should call *** and when I called I spoke to Thato and I gave her all the info required when she checked for me on the system she said my phone has missing components that is why it's beyond repairs...So I then asked her to send me pics even now nothing.. had to call again spoke to Gugu today she said they are allowed to send pics