The BBB is supposed to be an uninvolved 3rd party, they are there to protect the consumer. The only reason they should be worried about you going to the BBB is if they are guilty. It sounds like they are scared you will talk to the BBB, and car salesman are notoriously aggressive. They make their money by telling you what they want you to do. I lived with 3 roommates that were car salesmen, and heard plenty of stories about pushing customers around.