Avoid this business

Had the screen on my Iphone 6 replaced by this outfit. Seemed fine but a few months later it came adrift. When I had a look at it I could see that the two docking *****s were missing. So either they weren't tightened properly or were stripped. When I went back to the shop the response was .."well we don't have any *****s" I then opened the phone to discover that there were other *****s missing, one was lying loose inside the phone and another completely loose. What I also noticed when the screen was replaced was that the glass screen protector would not lie absolutely flat against the screen as it did on the original screen which makes me wonder if the new screen is not up to Apple spec.