Fidelis Elite Systems interview questions

HR called me and set up an interview time. When I showed, however, the office manager was confused about me being there. I was then told that the interviews were the day before, and they didn't know why I was scheduled for the day after. They asked me to call HR to set up another time to interview. I did so that day, and they didn't call me back until the following week. They told me that the job had been filled before I interviewed, and they sent out emails, but that my email was still in their outbox. 8 hours of vacation time I can't get back, and highly unprofessional.