I had a interview with BCG - 2 cases. 2 days after I was interviewed, I got an rejection email. When I was reaching out to the interviewers and seeking for potential areas to improve, the interviewers told me that both of them passed me for the first round.
He told me he's gonna reach out to the HR, and HR reached out to me today and told me she's gonna explain via a call.
I've asked around and my friends found it strange that the interviewers passed me for the first round but I still got a rejection.
What could be the potential reasons for me getting a rejection? How shall I talk to the HR during the phone? The call is scheduled next week.