Terrible experience at Champion Toyota Houston

My husband and I were seeking to purchase an new car last Saturday. We went to ChampionToyota in Houston last Saturday. After talking with the sale person, the sale’s manage came to us. He told us the final drive out price for the car we asked. I asked him the finance options, suddenly he turned to be very angry. He changed his mind and added taxes and fee on top of the drive out price he just offered. He harassed us to leave immediate if you don’t buy this car with his final offer, or he will call the security to force us to leave. Never experienced such a rude treatment, I was horrified.