Replaced screen but spinning stuck screw an issue

I'm having an issue with my iPhone 6 which I'm hoping you might be able to help me with. I cracked my screen last year which I just replaced myself but I'm sure you know that the thumbprint won't work anymore because it's not the original digitiser screen. More recently, after surviving many drops, the screen is now coming loose and separating itself from the digitiser part. I wanted to just superglue the screen back together but I want to take the screen off completely first but my issue is that one of the pentalobe screws won't remove and I'm stuck. Like its spinning on the spot but won't come out. I know Apple would replace the screen for like £80 which at this point I don't mind anymore but because it's not their screen I don't think they would change it right? Idk. Any help or advice appreciated. #imscrewed