Yeah, I would definitely go back and talk to a manager. At the very least.
They probably aren't obligated to give you any money back (though you might trick a stupid manager into it). But they would definitely have to take the car back if you put up a fuss. Problem is you got the car at a pretty good price either way. So it's probably not worth you giving it back and having to find another one. Hope you at least get something out of it - if you plan to use them for service, try and get a maintenance contract out of the deal. It's a dealer, so just an acknowledgement of the fraudulent advertising would be a win in my book
