.....but they can charge you an assessment fee just to look at your phone and they are not required to justify anything. Same thing if you take your automobile to a mechanic.

Your device had a 1 year warranty that you acknowledge has expired. If they feel the device has user damage, warranty is voided anyhow. Some damage is not visible from the outside of the device and cannot be seen without taking the device apart. This is why insurance is offered.

Sounds like you are just lashing out at the manufacturer out of frustration.