This sounds all too familiar. I too live in NC, and was in an accident causing almost $9000 worth of damage to my 1996 Acura. It was the other guy's fault, so I filed with his insurance company a diminished value claim for the loss of value on the vehicle. The insurance company (AllState) offered $1500 and wouldn't budge from there. My Acura dealerships were much less helpful than your Lexus dealership -- they all said they wouldn't put anything in writing. AllState said I would need to have my own appraisal done to dispute their figure. I did -- I hired Wreck Check to appraise the loss of value. Their appraisal came in at $2600. Faxed that to AllState, they still didn't negotiate. At that point, I had to file a lawsuit in Small Claims Court to get anything over their $1500 offer. I couldn't sue the insurance company since it wasn't my insurance company and they, therefore, had no obligation to me. I had to sue the party that hit me. My accident happened in Raleigh (where I live), but the person who hit me lived in Charlotte -- so I'd have to go to court in Charlotte. I came oh-so-close to filing the suit (got the papers, wrote out the check for the filing fee)...but I finally caved in and just took the $1500. By that point, a year had passed and I was sick to death of dealing with the accident and the losers at AllState. If I could have gone to court in Raleigh, I would have pursued the case on principle if for no other reason.
If you decide to dispute the insurance company's amount, I highly recommend Wreck Check. They have an office in Raleigh and one in Charlotte (maybe more). Their fee was $125 -- and they use a software program to calculate diminished value, so it's the least-biased (and most robust) appraisal you can get. (The program houses all sorts of data on similar vehicles with similar damage, etc.) The website for the Raleigh office is
www.diminishedvalue.com. Good Luck!
Lianne