Yep! This used to happen to me quite frequently. I always turned down the "upgrade" and when I went to get the car, well surprise, it was the one (or category) they were trying to make me pay for! Happened once at Dollar and they gave me a big SUV - I'm a city driver and am not comfortable driving such a big car (a Tahoe). They had to send someone over to the Dollar side to get me my compact SUV! Which is what I reserved.