I cleared the OA. I was invited for an on-campus interview. Few weeks after the interview, I heard from an HR person saying I cleared the interview, and I was invited for the Tech Night. She also said there would be another round of discussion on the day after the Tech Night. Until the day of the Tech Night, I didn't receive any invite, and my interview was not scheduled. Hence, I emailed the HR. My interview was then scheduled for the next day. However, I was scheduled for an internship interview instead of a full-time one. They then called me up to inform I will have a phone interview on another day, and they canceled the scheduled interview. There is no response from them for over a week, and no interview was scheduled. I have to follow them again. The HR said I did not get selected from the very first round. Very unprofessional of them to give me a false update all the while. Who does that?

OOP questions.