Have glass replaced from iPhone 6 plus.

Have glass replaced from iPhone 6 plus.
I asked for some discount this was not possible and was told because it is quality glass. then I have faith in this. after a day I was able to pick it up again to my horror, the glass protruded a few mm above and there was a plastic piece of paper in between. went back with this but he indicated that this is how it should be and did not respond to it.
count down again later and instead of cracks as normal. glass breaks loose.