Hong Kong Housing Authority interview questions

Applied online, need to email copies of education qualification and working reference by post before review your application. No update for quite some time and need email them to check on the status. Interview at Housing Authority HQ, the interview is less than 15min, starting with a short self introduction and a few questions related to the most current job, then suddenly, they told you the interview is done, not even have a chance to ask the interviewer anything. Despite I may not be a suitable candidate for the post, at least they should respect people spending time to attend the interview, if you are bot interested at all, may be it would save both parties time to reject the application.