A2A Optima interview questions

It was really disappointing. I was asked to come for 3 rounds of interviews at the office, but after 1 round I was asked to leave, if they already had intention of rejecting candidates based on first round they should do it online and stop wasting candidates time and effort and also that 1 round was just intro round, who gets rejected in a introduction round??? it was really unprofessional and they should streamline their interview process.