Xebia UI Developer interview questions

It was very lengthy. I had a telephonic round on 22 of Feb and it was nice as the interviewer asked several quality questions. after 1 month I got the call for an assignment which I did in 2-3 working days and submitted. after 8 days they called me for a F2F round where the person reviewed my code and I felt I did really well. but very soon after that Hr said its not possitive. I did not understand why the code was not reviewed before calling me and even I answered everything and did well, still I was told to leave. it was disappoinitng as it took too much of time and no proper feedback was given.