Robert Walters interview questions

I was first asked for my availability next week. When I gave it, I was told that they're actually completely "swamped" for next week and will contact me again next Friday to follow-up. On Thursday, I get an email advising there's an interview scheduled for Friday. Not asking for an interviewing, advising there already is one. After last-minute arrangements with my supervisor, I was approved for time-off and replied that I am available for the interview. Within a few minutes, I get another email advising the interview has to be cancelled because all positions are taken. I couldn't believe they booked and interview and cancelled it within the hour. When they offered to reschedule another within a few months, I asked if there can be some assurance that these last-minute cancellations won't happen and I never got a response from them again. This was extremely unprofessional!

There was about 2 - 3 interviews and 1 in-person presentation where you would roleplay as a TA working with a potential client. First is TA then Managers, lastly with office Director.