Ran over phone, won't turn on, but canhear it ring onthe phone

I accidently left my phone on top of my car, when I finally realized it was too late and my phone had ben run over multiple times on the highway. When call it, it does ring and go to voicemail, but my phone doesn't lightup/ring. I have it in a lifeproof case so only the front is messed up (its in shreds) but the back is fine andthe camera isn't scratched at all. I was wondering if i should try to fix the screen and make it work, or just replace it?