Sold a car right out from under me....

I went twice today. First time they said come on in. Your credit if fine. We'll get you in the Infiniti, no down. You'll leave here in less than two hours with the car. I get then they said the "approval" was tenative and they wanted me to go to Finance and wait. I walked out and said do what you gotta do, call me when you have an answer. They called me 8 hours later and they said I cannot get into the Infiniti but they had me already approved for a 2010 Ford Fusion. I said I'd be there in 30 minutes. I confirmed with "Patricia" that I needed no down payment and that I would be there in less than 30 minutes. She said come on and you'll leave here with the car in less than two hours. I got there and after 30 minutes, they said they wanted 2000 or 3000 down. Sales guy named John or Joe said he had just talked to the GM and that was what he wanted. I was pissed of. I went outside and called the number and asked to speak to the GM. They said the GM had left hours ago and they would leave a message for him...Lying MoFo's...I will most certainly stri up as much trouble as I can for them and spread the word that they are crooks. I will also file a complaint with the Texas Attorney Generals Office regarding their obvious deceptive trade practices.