The glass on my iPhone is separating from the digitizer assembly.

I replaced my iPhone 5s's screen a few months back and everything went smoothly. However, recently I've noticed that in the top left corner of my screen, the glass part of the screen has begun to peel away from the rest of the digitizer assembly. This was made worse after a small drop (oops) and now the entire upper part of my screen has begun separating.

I was wondering what my best option to repair this would be, part of me is tempted to take off the screen and try supergluing/epoxying the glass back into place, but I'm afraid that I'll unintentionally break something else. I didn't purchase the screen from here (bought from Amazon) and I'm not sure of the best way to contact the seller.

Thanks!