CognitiveScale Software Engineer interview questions

I had phone screening and all was good, I understood exactly what needs to be done, and knew I could do faster than they expect. Next week I was contacted again. The onsite interview was scheduled 3-4 days ahead. It should last 4+ hours on average. I have spent evening preparing for the interview. The whole thing for me including driving should be around 6 hours -- so I have allocated all day for that interview. Spent 50+ minutes driving to their site in the morning traffic. When I was getting to parking lot 15 min before the interview I got a phone call and was told that they hired someone and I can just go home. I found that to be really rude on their side. I lost pretty much whole day because of that. At least they could have interview me and say no. While everyone I spoke with appear to be nice on phone, I have strong feeling that this company does not care about people at all. While this is negative experience I am glad that I learned how they treat people right away. Could me much worse if I had to learn this while working at this firm.