I have been shafted by "expert panel repair shops" twice. Once, many years ago when a twit bashed in my left fender on my brand new VC Commodore and the second time when I picked up my JE Camira after it had been nose to tailed. With the VC the colour match ("Atlantis blue") was terrible! The guy just said..."Hey...it's hard to colour match new cars!" My reply was, "Crap!". After some heated phone calls with the insurer the work was done over again at a different panel shop. I also scored a hire car for the week for nix because of the inconvenience. The outcome was that the second paint job was flawless...it looked "as new" which is what anyone should be able to expect.
The second time I drove the Camira home only to find the auto shifting was playing up badly. I called the RACV and the nice mechanic told me to refill the tranny with new Dexron tranny fluid. Problem solved. Getting the panel beater to admit to overlooking this simple check was a nightmare!
I know panel beaters have a hard job and have difficult customers at times but, honestly, if you are in the trade your first rule of business should be like the doctor's Hippocratic Oath which states: "First do no harm."