Customer center at Game ripping pensioners off

We bought a phone at game Louis Trichardt and it had some issues we then took it back to the store and they sent it to repairs where they called and told us to pay R2000 for the repairs of a Samsung J5, the phone is still under warranty ok we rejected the amount and the instructions we to return the phone. It took them about 8 weeks to return it. After they returned it was missing the home button, other buttons and some *****s. When we went to game they told us that we should return the phone where they repair it and now it’s back still unfixed. But they just put the visible parts back. How do we then accept such a phone after what had happened.