Amadeus Production Support Engineer interview questions

Never attend interview in amadeus, so pathetic. They will call you every alternate day for face to face interview at least 3 times. After that they will be no feed back. You feel that you have cracked the interview as you have finished with technical and two managerial rounds, but they never turn up after that. Even after interview they make you to wait for 3-4 hours just to say the feedback or to say you can leave will call you for further rounds. I almost wasted my 3 complete day here for interview process and there is no feedback.