Defective, damaging, immoral MTN

I am sadly a contracted user of the MTN network - Many weeks ago I had my phone taken in for repairs as it had issues with the touch interface, I was told that I would get my phone back in two to three weeks, however after battling with mtn I got it back after four+ weeks. The issue was fixed but now my charging status was forever \slow charging"even when charging directly onto a wall power outlet and the phone did not pic up when connected to my laptop via usb cable (still slow charged). So I took the phone in again"