Dead spot on iPad Mini screen!?

Ok so I replaced my iPad mini's screen for the first time because I cracked it! When i First turned it on after the replacement it worked fine except for a small "dead spot" on the diginalizer. It was a line from left to right on the bottom of the device(Not Visible, will not recognize touch) It was so small so I didn't bother with it. A few weeks later it is about a half inch think and it is at the top of my screen now. I can't do anything without twisitng the iPad billions of time. I re-seated the diginalizer and got no results! Is there any way I can fix this because I really would like to use my screen again!