Mention the fact that the automotive ombudsman would be interested in this case. All dealers, by law, have to disclose the known history of the car prior to sale. If they knew about the accident, the damage and subsequent repair, they should have presented you with a written/typed disclaimer. This allows them to cover their own behinds if you decide to claim warrantee issues. I believe without this documentation, they have, in essence, misled and lied to you. Read through the sales documentation that they gave you, and look for anything that relates to the prior condition of the car (eg, "This car has not knownly been involved in an accident OR the buyer has been informed of such said damage to the vehicle" etc etc). See what it says.