I got a quote on a vehicle on 9/09/19 and I promis...

I got a quote on a vehicle on 9/09/19 and I promised them to bring my wife and buy the car the next day morning. The next day I was told that the vehicle price went up by 6K and that there was a computer glitch and so they had incorrect price. My question is how come they didn't notice the "Computer Glitch" all these days and gave "on road" quote to all their customers and all of sudden figured out the glitch? Not happy with what they did. Please don't waste people's time.