Ipod touch 4th generation camera doesn't work after smashed screen replacement

I have an ipod touch 4th generation that i smashed to screen with a torch, i got the screen replaced however my camera shutter will NOT open at all, i can go into camera roll and everything BUT the shutter wont open and the slide to go from camera to video just blinks a few times. Ive tried everything from turning it off and on(note my off/top button doesn't work) I had problems with the camera before i had the screen replaced but now it doesn't work at all. And will resetting and/or restarting it through iTunes delete ANY of the conent i have on my Ipod?

Any help much appreciated as i can NOT afford to get it fixed at Apple!!😢