compromised wrong fit, touch screen

I bought the film she was priced in the middle.
Unfortunately, I had a few hours notice that my TouchScreen after applying unfortunately no longer 100% working.
Some were touched not registered. At first I thought it is the Iphone itself and was on the phone with the Apple Support. When asked of which
if I have a protective film on it, we had solved the problem. Slide down and everything works perfectly again.
Likewise, the fit is not ok, the recess is lacking front of the camera.
One should have expected at the price.