Tire blown ?

[NFSZ86]

Hey guys I know there's probably a thread on this already tried to search but no luck. See if someone had something similar happen to you. While I was in the highway earlier today I started feeling a shaking so as I pulled over seen the inner side of the tire wall separated from the tire. I just tough I had low air or a flat. The tire had air and has been fine now I only had the tires for about I say 3500 miles is there any warranty on these or something that can help ? I really want to try to save the 400 dollar retail now the bad part I got the tries and wheels from a forum member so I do not have the receipt =(( the tire is Bridgestone potenza RE050A with Nismo wheels any help thanks in advanced. Here's some pics