I was messaged by a recruiter after applying for the position and an intro call was set. 4 minute before the start of the interview she sent an email asking to reschedule and asking about my schedule. After replying I haven't heard back, even after sending another email the following day.

The interactions were only through emails while scheduling interviews. Started with the initial screening round, followed by another discussion round. Then there was a technical interview which was scheduled for 90 minutes, the interviewers were not keen on knowing my technical expertise or work experience. They closed the interview well within 35 minutes. That's it. After this, there wasn't any communication at all. I even reached out to them for the feedback. But there wasn't any response. The HR should consider the time spent by a candidate for interview preparation and interview process, spare few minutes of their time in proving feedback. This is the least any candidate would expect from respective representatives.