Samsung Research America Strategy and Operations Manager interview questions

I had a very bad interview experience with Samsung Pay. So the recruiter reached out to me and scheduled an interview with the hiring manager. For the first interview, the hiring manager was 15 minutes late and we were able to talk for about 15 minutes on the phone. So he said that he would want to talk more and scheduled another 20-minute interview to make up for the time lost. For the second interview, 25 minutes into the interview and no call. The recruiter then emailed me and wanted to schedule for the 3rd interview cause the hiring manager was busy. And my 3rd interview ended up with no call. No email afterwards. I would say this is highly unprofessional in the way they conduct interviews and treat candidates. Such a waste of time to prepare for the interview.