Out of curiosity, ask what the cost will be to R&R. If they come up w/ a price too quickly, then you know they're jerking you around. Also curious if you threw them a bone like an oil change or some other maintenance in addition to this request or took it in just to get this work done for gratis on a car out of warranty? No worries, there are plenty of other p-dealers in Philly area you can patronize in the future.
In the mean time, DIY fix is simple enough... just lay a bead of clear silicone caulk inside the housing where the seam is and all will be fine. Shouldn't take you but 30-45min tops to do and then let the silicone cure for a few hours.
Good luck
