Was emailed by an associate asking if I wanted to ...

Was emailed by an associate asking if I wanted to make a reservation to see a car that they were selling. Arrived, after making the reservation 12 hours before, and was told another customer was about to drive the vehicle. Was shown another vehicle that was not for sale and sat around for 30 minutes. Repeatedly asked if I could see the vehicle I had reserved. Finally, once the other customer had committed to buy, they came and told me that I would not be test driving the vehicle since it is effectively sold. Why have reservations, and ask customers to reserve, if anyone can impede on said reservation? Drove an hour to get here in Charlotte traffic... Very unprofessional.