My iphone has a fake front camera?

Yesterday i went to a shop to get my iphone screen fixed (as it was all broken) i payed £110 for an 'original apple screen'. But even my friends have noticed that when i senf snapchats they are bad quality and my front face camera flash turns my face green. Is it possible that they have stolen my real camera and replaced it with a fake one? Can i go to the store and get my money back? I was going to go to my mobile operator shop first to ask a professional if its real or not.

It's more likely that they haven't reconnected the camera and/or lens properly when they removed it to replace the screen. You're entitled to return to the shop and have the faulty camera fixed or repaired.