Commonwealth Business Bank interview questions

I had one phone interview and then a face to face interview that was supposed to be the final interview. About three days after the “final interview” I received an email informing me that another person had to interview me because he was supposed to have been a part of the other interviews but wasn’t invited. During that extra interview I asked about the timeframe for their decision and he stated he was just starting the hiring process. This really annoyed me because on that second interview which I had been told was the final interview, I was told they’d be making their decision on the candidate within a week.