We had a pre -negotiated price for the trade in of...

We had a pre -negotiated price for the trade in of my car and the acquisition price of the car I was buying. When we arrived they tried a price switch. Not a small one either but a difference of $3000! Really sleazy. Luckily we were using a Car Concierge to prepare everything. He was able to get us the original deal. The dealer is 40 minutes from my house and only that morning it occurred to them that we were not going all the way there just to do paperwork. Luckily the Concierge checked with them. They even told them it was not possible to pick up the car because of the registration. Then we told them to just switch the plates rather than issue new ones. Oh yeah! Why didn't they think of that? Then it took over 2 hours to get the paperwork ready when they had all the information they needed the day before. We sat around like idiots for 2 hours when the whole thing should have taken minutes. I've done this dozens of times and this was hands down awful.