Olathe Dodge Chrysler Jeep Ram

We saw an ad in the KC Star for a 2007 Suburban for $15,900. This seemed impossible, so we called to confirm that this was not a mistake. They assured us it was not, so we drove 45 minutes to test drive the car, prepared to buy it. We liked it and told them we would buy it. The salesman returned five minutes later and told us that someone else had come in while we were test driving it and they were buying it. We were disappointed. Several days later the ad was in the paper again for the same price. We called, and again it was for sale for the same price (they checked the stock number for us.) They all denied that it was a missprint. We told them what had happened to us the previous weekend and told them that we would be in after work to buy it. Then they put a manager on the phone, who told us that the ad was a missprint. Why the lies? And why was the "mistake" repeated??