I make and appointment 4 days before my arrival to...

I make and appointment 4 days before my arrival to buy a car. Before i leave from Calexico Ca to Palo Alto (8 hours drive) i make a call to confirm my appointment and the availability of the car, they confirm the appointment and said that the car was still available. And when i had a 5 hours drive i recivided a message that the car was sold that day. This is very unprofessional.