VendorPanel interview questions

It was like a regular catch-up meeting. Understanding the role and business. What is expected? Knowing and discussing my experience. It was all easy. Then I was moved to the 2nd stage of communication and presentation. I was told the same day that the interviewer was sick and would conduct it the following week. It never happened, and I got an email saying they have already hired. I found it very unprofessional and a waste of time and energy. Moreover, I wasted my leave for the day.