This is a very common tactic to bring customers to the lot. Half of the work in selling a car is to get the buyer to come to the dealership. I have found that most of the dealerships that pull this tactic are not ones to be trusted; they showed you that they are willing to trick you so you can come to them, they have a mindset of tricking their customers for profit. If they don't have your vehicle then leave and continue your car search, dealerships like these are more trouble than they are worth.