A listed company, but that doesn't really have anything to do with the staff.

I received an interview invitation from the company through the website, and they also asked about my availability for the interview.

After I replied with my availability, the HR representative disappeared and did not respond for a week. Since I believe in being proactive when looking for a job, I called HR to confirm the time. The HR representative sounded very cold and unpleasant, saying that they would send me another email—and then it turned out to be for a different position??

How unserious can you be at work?