IS THE S6 FAULTY??

Hi there, I am wondering after considerable research on sites such as this if the Samsung S6 is in fact faulty or if there is a batch that is faulty. I got one on the 7th June and returned it on the 13th June. None of the apps worked, the Internet wouldn't work, they playstore could either not find apps or battled to download them, the battery died within 4 hours, signal was always terrible. The phonebook duplicated everything 4 times and then removed names at random. I have returned the phone within the 7 day period and it was sent for testing only to be returned saying the IMEI number worked. No one has tested the actual functionality of the phone and all I am reading both here and on Facebook is that the phone has issues and is being returned at an alarming rate. My other concern is that the service provider who is handling the query is not doing anything to resolve this issue. I would be very concerned about this if I was you. Can SOMEONE PLEASE COME BACK TO ME REGARDING MY PHONE. I have had the contract for 5 weeks and only used the phone for 4 days in which it was faulty. What is going on??? I am honestly at the point where I would rather cancel everything.