Just a little advice, don't be too persistent. Take a breather and get back occassionally. They are there to sell new cars and may see you as an agravation and just decide not to do you any favors, so I would not push the issue too much and ruffle some feathers. Stay with one contact person. You may offer an incentive as Vince suggests, but patience is the game at this point. Don't expect them to have the same enthusiasm or devote the time you would expect.