Yeah, don't bother losing your temper. It won't have a positive outcome.
Small claims court is easy and they can't send a lawyer. You can also claim for your time, filing fees and potentially, punitive damages. In the majority of cases they will settle once you have filed, if they don't they have to explain to the judge personally why they won't rectify the damage they inflicted.
Don't be too upset. You can have a body shop restore the underside to much better than new specs and get the dealer to pay for it via the court. Bit of a headache but live and learn.