I went to a car dealership to test drive a vehicle that I was interested in. After test driving, we discussed some issues that the vehicle had, and they said all the vehicle needed was an alignment and if I took it to the tire shop they would cover the charge. I ended up signing a form stating that I would trade my 07 Tahoe LS for $18,500.. for a 06 ford f150 for $29000. The Tahoe only had a remaining balance of $13,500. I ended up leaving the dealership in the truck , and they sold my tahoe that day , without me ever paying for the truck or them paying me for my tahoe. All of this occured on a friday. Since I had to make an appointment to get the vehicle aligned, the only day I could take it was the following Thursday, because I was busy throughout the week. I did not continue to drive the truck. I drove the truck to pick up another vehicle until I would have to take it to the tire shop. That thursday, I took it to get it aligned, and the tire shop informed me that even after the tires were rotated, balanced and aligned that it continued to pull all the way to the right. I took it to a few other places to get it looked at, and they all told me the same thing, that there were other mechanical issues. I told the dealership that I was no longer interested in keeping the truck. They then informed me that they had already sold my tahoe. Up to this point none of the paperwork with my bank had been completed. This happened all within a weeks time. The day I told them I was not interested in keeping the truck, they immediatly took a check and paid the balance on my tahoe which was only $13,500. Not the agreed upon price of $18,500, and my tahoe had already been sold. I was not aware of them only paying the balance until a month later when I finally found a vehicle to buy and my bank told me I did not have any money left over from the sale of my tahoe. I attempted contacting the dealership manager and also sent him messages to his phone but he has yet to respond. What can I do to resolve this matter? Should I sue them... They sold my vehicle without completing the sale, and without paying the balance on it.