CARMAX Carmax used fraudant means to lowball the value of my car Internet

On July 15, 2012 I went to Carmax Dealership in Torrance Ca. I was laid off as a Police Officer after 34 years and needed funds to cover our rent etc. I had a clean 1999 Cadillac Deville with only 120,000 miles on it. I knew going in I wouldn't get a high blue book but maybe something in between. I paid $5,000. for it two years prior. The Carmax inspector told me that my car had "prior frame damage".  When I was at home later, I observed on another page in his report from autocheck, that my vehicle had no frame damage reported. Based on that info they offered me $1,000.! I was upset with the Cadillac dealership that sold me my vehicle. I started legal proceedings against them. On July 26, 2012 my wife was rear ended while driving my vehicle. Farmers Insurance Adjuster filed a 28 page report which indicated also that my vehicle did not have any frame damage until the accident on July 26th. Farmers also valued my vehicle at $5,426.63.