IQVIA Associate Consultant/Consultant interview questions

I applied through school career website and they invited me for a video interview(30 mins case interview and 30 mins behavioral interview). The manager didn't show up for the case interview so I waited for 30 mins. They said the manager didn't receive the interview invitation. Anyway, they rescheduled it. The case isn't hard and only take the last 10 mins for it. He used the other 20 mins to go through my resume again as what they already did in behavioral interview. In the end, I didn't get second round invitation or a rejection email. They just ghosted.