damn, that sucks. ask your dealer if they have a contracted PDR tech that comes by to fix dings on used cars and customer vehicles.
also check
DentWizard.com: Dent Repair Services, Paintless Dent Removal
they are nationwide. only thing is though, rear quarter panel is difficult to access on
this car unless accessable from the wheelwell. will require the tech to drill a hole either from under the tail lamp (trunk liner
needs to be removed to remove tail lamp), or from the door jam to feed his tool through.
since it's on the gas filler side that makes it more challenging where to drill the hole....
GL!