1 data structures and algorithms round , 1 system design and 1 hiring manager, dsa round focuses on graphs and dp , system design on low and high level and hiring manager is behavioural questions

First of all, HR called for scheduling interview time but after that she never sent the confirmation mail. When on the interview day I called her , she did not remember anything but pretended as she has confirmed the interview with the panel. She asked for my Skype ID then I reminded her that it was supposed to be a face to face interview. She did not even met me when I reached the office and sent some one after half an hour of waiting for proceeding with the interview. First round went well and the interviewer asked me to wait. But after waiting for 40 minutes when no one appeared, I called the HR. This time she replied that your interview review was good but we cannot proceed further. I left the building smiling (frustrated from inside)