I saw a Jeep once that was way under priced. When I asked about it the salesman quickly corrected the pricing.
Another time I was charged more than the marked price for an item at a grocery store. When I questioned the price they gave me credit and fixed their signage.

IMO,,, both instances were handled like I would have expected although I wish it would have been the opposite. I'd have gladly paid a dollar more at the grocery store if I could have gotten that Jeep for half price. Never seems to work that way though.