Vanguard Events interview questions

I applied on Linkedin, the HR recruiter contacted me very quickly for a face to face interview in the office. Once I got to the office, which was a bit old and run down, I waited for 20 minutes before my interview! If I have an interview at 3:00pm I expect it to be at 3:00pm. I can see waiting a few minutes, but 20 minutes is unacceptable. When the candidate before me was finished I started my interview. After abut 20 minutes it was over, and I was invited to come back for a second round interview. The second round interview would be me watching some kind of presentation, which they did not thoroughly explain well. So anyway, I was expecting to come back for the second round interview the following, but the HR recruiter left a voicemail saying I have to reschedule. So I called back twice, nothing in return. Then I emailed her, then she said they had chosen someone for the position Monday so they are not doing any more interviews. Like, what kinda crap is that? I feel like it was a waste of my time, very unprofessional.