ONCE WORKED NOW DON'T

I took my iPhone 6 to weFix clearwater mall to replace my screen as the ink leaked inside the lcd ''BUT WAS NOT CRACKED AND WAS WORKING.'' WeFix installed the new screen but was ghost typing. Took the phone back and they put a new screen on but did the same thing. I decided to take the phone back to get a refund and put my original screen ''THAT WAS NOT CRACKED.'' That morning before taking the phone to weFix to put my original screen back on, i received a call and upon anwsering the call the screen went blank. I explained to the technician that screen went blank all he said was he'll put my original screen back on. Waited at the store patiently for my phone and received my iPhone with a cracked screen and not working. I left store than tired to connect my iPhone to itunes to back up my phone and it did not connect nor did it charge. Took it back to weFix clearwater and explained to them what was wrong and now they say that the motherboard is gone and they said was irreparable, which I did not understand as the phone was working. I went to the store over 6 times to sort out this one problem and even requested for them to put a better screen but they did not. My phone was working pefectly fine and i used phone for a month after the inked leaked inside after taking it to weFix it dont work. WeFix should rename themselves to WEBREAK.