My friend did a housing swap on my iPhone, when i gave it to him it had like 40% battery and after it was done it had 12% battery. So i took it home and noticed that it doesn't charge, it is stuck at 12% and won't charge, i do however get the charge symbol so the dock is working, also the phone keeps respringing and you can see white shadow around the screen. It also had missing bottom screws, so i took the back plate off and noticed one screw was missing. What do i do? 