Well, what that you are trying to pass across cannot be the truth of the matter. You might think that you performed excellently, but to the interviewers, you might be the dullards among those that were there with you. Keep on trying and forget about tribalism or whatever, it has happened to me in UNILEVER in 2004, despite all my efforts during the last stage of the interview, an Igbo woman was to attend to me, but she denied me totally, like wise, in UBA, another Igbo woman did same to me, but i never thought that it was solely based on tribalism. Bros, if you have not fallen once, you can not rise.
Continue the race until you get to the promised land.