they probably WANT to screw their customers just so they can resell the car 'on ebay' as he mentioned to you for more money.
sorry for your loss, but i wouldn't take anything other than the ABM that you originally wanted. you could try calling back in a week to see if anything changes. otherwise i would start reporting him through all the media outlets (local television news will really get his panties in a bunch.) they treat customers like this because they don't think you are capable of hurting their business. well its time to show him why you don't treat your customers like that- until 1. he loses his job or 2. he changes his business practices.