Issues after getting screen fixed

I recently got my samsung ultra screen fixed by u break i fix or whatever that company is called and ever since i've had more issues arise. my phone started to be unresponsive my the finger touch so i had to start using my stylys for everything. then my phone started to over heat and turn off from over heating. now my phone won't even turn on and it isn't registering when my phone is being charged. what in the process of fixing a screen can cause all of this to take place?