Rusnak BMW

Rusnak salesman offered a 2009 X5 at $10K below sticker. At a subsequent visit, I was told that the offer was actually not applicable to that model, but they would honor it since it was already offered. I confirmed this in a phone call conversation a day later. Another day later, after paper work was initiated and 1 1/2 hours at dealership, I was told they would not honor that price. Not sure if they strung me along thinking that they could make up the difference in the trade in, financing, or think that I would settle for less, but I left in shock that they could actually do that and think it's okay. I don't appreciate the good cop/bad cop game they played and quite honestly turned me off to buying a BMW, period. If this were just a mistake, they could have told me during the second visit, and I would understand that this was a business decision. But my experience with this dealership is what gives car buying a bad name.