I asked to see a specific vehicle I saw on Autotra...

I asked to see a specific vehicle I saw on Autotrader and one of the salespeople confirmed to show me this vehicle, and I asked several times if he had it prior to visiting the dealership. I showed up to view the vehicle and he was about to show me a different car because the one I asked about was 'sold' the day before. I don't want to assume but the way he acted throughout the whole communication, I am not sure if that vehicle existed to begin with. I don't know why he did this wasting my valuable time. He didn't seem sorry nor concerned. I think this is very unprofessional.