Acrolinx Software Engineer interview questions

I applied to a position on their website and got a response. On the day of the interview a couple hours before we're supposed to meet. I got an email saying they have to cancel saying they've already hired someone. I would've appreciated them telling me at least a little earlier as I had to take time off to interview with them. Cancelling a couple hours before the interview is just ridiculous and extremely unprofessional.