I've had shit like that happen and it has pissed me off as well. But, it DOES sound like it may have been a poorly written ad. If the first thing he did was come in and let you know that the ad wording wasn't very accurate, I'm guessing a few people mentioned to him that it was misleading.
Then again, he's on the front lines, so probably wouldn't have placed the ad in the first place. So, you could be right that it was done that way intentionally. In that case though, the salesperson wouldn't have had anything to do with the ad itself and was probably having a MUCH worse day than you, dealing with a slew of angry people.
