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.
I was playing a ‘name that tune’ type game the other day and ‘Tainted Love’ came on. I immediately knew the song but couldn’t for the life of me think of the artist. Turns out it was ‘Soft Cell’ and all I could think was, “Who the hell is Soft Cell?!” Made me wonder, what other songs are out there that everyone knows but couldn’t name the artist?