Capgemini — Professional Etiquettes not followed by HR Interviewer

Hi Team,
Interview reschedule for 4 times in Sept Month and then I went through virtual interview interview for PowerApps profile and on next day I missed HR call post that I didn't received any update as I knew that I was selected since I have given technically which was thoroughly done.
Again after an month received interview call today from same HR. She scheduled my interview as slot booked for half an hour as usual. I joined meeting within 5 min and Interviewer asked Hr to again reschedule the interview as he Is having another call at the same time and saying post call since 15 minutes not even completed after disconnected the call and complaining to me that I have joined 15min lately to the scheduledcall which was false statement.
Request you to not schedule interview for any candidate if interviewer\HR are not confirmed with time confliction and not valuing the Candidate time.
If 1 interview panel is not available any back up panel should be there .

Note: Please respect everyone's valuable time