^^^x2

go up there and raise some hell. I had an issue like this when I traded a car for a cheaper car. I was going to trade one car for 2 and when the dude could not come up with a second decent car i told him i would just take the cash differance. He wanted to charge me extra for this and that. I finally told him I was going to call the cops and take him to court for and then he finally gave me the money.

just go raise hell. mention the Better business burea and some court that should get the ball rolling