i think it pays to get your own quotes, at places that have been recommended by friends/family that have had experience a panel beater.
for example, my mums fd, had some front end damage and had some damaged to radiator support area as well as the front bumper. this 'aami approved' centre fixed the bumper only (looked good from outside) but didnt even bother fixing the damage that was behind the bumper.
we didnt find this out until we had another panel beater spray the bumper (yes another bump) where the panel beater had took off the bumper to see the damage was left unrepaired underneath.

