I think he's talking about his 02 SER, not the Z in the pic.
Either way, go in and talk to the service manager and/or whomever is above him. Be calm, cool and present evidence and/or testimony of people that were with you around when you noticed the damage. pictures would be great. Seeing as how you JUST bought the car hopefully you have some pics. If your insurance company took a look at it when you bought it you can have them attest to its good condition in an affidavit of some sort. They sure as hell don't want to pay for the damage. Go to whoever you have to within the dealership and present your case. Don't say a word about a lawyer. As soon as you do they will say, "I'm sorry our legal team handles this stuff, and Im going to have to refer you to them". Because they don't want to make the situation worse by saying something they shouldn't have. Most likely you can handle it in house and get it fixed there. Especialy if you bought your car there.
When I worked at Graham, we had some guy who happened to run into one of the owner's and asked how he was doing. He complained about the time it's taken to fix his explorer and poof, all of a sudden this guy was customer #1. His car was put at the top of the list and we even delivered it to his home, which we never did. Talk to someone higher up your more likely to get results and faster.
It's ok to be passive. Just don't be comfortable being a victim of someone else's carelessness with your car.