Horrible service by people working inside Phone MD...

Horrible service by people working inside Phone MD (futuretel) specially Benny who is the incharge in service and repair. Its a samsung authorizd service center and i dont know how. I gave my S8 for screen repair and this person screwed up with phone earpiece. Gave back in service and he didnt find any issue with phone. 5 minutes out of store with phone and the problem was still there. Showed the issue live and found that this person glued the back cover so tight that it screwed up the phone. That is what they gave me as an explaination. Seems like the incharge of the service center doesnt know how to fix phone. Certainly don't deserve to be samsung authorized service center. I dont know for how long now this phone will work.