I will never use this website again!

I will never use this website again!
I ordered a refurbished Iphone 6 from this website and it arrived a week later (despite the 3-5 day promise) As I opened the item it was in a very good condition, however, when I attempted to use the phone there was a problem with the screen. The screen was blurry and jittery and I could barely make out what it said on the screen! I sent it back that afternoon and have had nothing but problems trying to get a refund!