Bests & Worsts Reviews from Amazon

I bought this phone in July 2016. As of this past week, it has stopped working altogether. I contacted the seller for assistance, and because more than 90 days had past - there was nothing they could do. I tried working with Apple to troubleshoot to no avail. I'm not even able to restore the phone to factory defaults using iTunes because of the error messages. Right now, the phone won't even turn on. At the time I purchased the phone, it was listed as a "certified refurbished" product. After paying nearly $400, I would like to think that the phone should last at least a few years. I just purchased a brand new iPhone directly from an AT&T store and hope for better luck. I will never trust "certified refurbished" again.