Screen is ghost touching because of tightness

My after market iphone 5s screen,has been pressing stuff on its own for months now,its an underworld to live with,the original screen and mobo got fried from a very unprofessional technician that i trusted my phone to change its battery and long story short this is my 3rd screen put on,at first it worked fine,but then i sent it back to get my front camera alined cause it was capturing a bit of bezzel,but then the phone started acting up,finally i opened it up my self,checked all the connections,everything worked fine but it still was doing stuff on its own,then i turned on the phone without putting the screen back in the body,and shazam,it worked fine,then i accidentaly placed the top of the screen back in the body,and shazoom,it started lagging a bit,after that i put it all back together and as it was clicking in,it went crazy.What can i do,since i got a new phone i dont want to spent any money on the 5s,would there be a more logical solution to this? Also please give me some tips on how to open up the phone without the home button cable pulling itself out,luckily the oh so bad technician broke the metal thing that holds it on or else now i would be buying a new home button too.