When I bought a SEAT Leon, I managed to look at the owners manual, and the owner had written their name, address and phone number in it!
I called them and they told me they had hit a Deer which was why the wing was fitted wierd (something the dealers said was just how they came standard, and this was a SEAT DEALER)
I told the dealer I have spoken to my brother in law who was a copper (no, he isn't) and that as it was bigger than a dog they had to report it to the police.
They dropped a GRAND off the price as it was THEM who had done the repairs
Just try to gather as much info as possible. The link HassanZ posted is a great place to start