Bricked ATT Note4 after software update. What do i do?

I finally was forced to update to android 5.0.1. I updated at work but it failed halfway through and is now in a boot loop. I've tried every solution the internet can provide me. What do I do now? The device IMEI has a limited warranty until 2017. I purchased through swappa. I have original box but no documentation besides the barcode sticker on the side. Will AT&T replace this? It was their update that caused this anyway. Any experiences with this sort of thing please? I dropped a large chunk of change on this paperweight. Thanks