Luxoft Java Senior Developer interview questions

I applied through their web portal and received a call from HR to explain the recruitment process. First round was Technical Interview which consists of a coding question and basic questions on Java and Spring, Hibernate framework. Interview went surprisingly well until the interviewer shared the feedback with the HR. Feedback was totally arbitrary and mentioned I was unable to answer questions on topics which the interviewer dint even ask! Regarding the coding question, the instructions were not clear and was expected to solve within few minutes just like the answers were ready in my IDE! Basically it was just like the movie Sully, where the investigation board expected the pilot to land the plane out of the blue without considering the human factor. Have contacted HR about this, but haven't received the response yet. This is unprofessionalism at its best.

Had two interviews with Luxoft but not sure what their team is expecting. In-spite of pretty good interview, was rejected without any concrete reasons. The interview scheduling took at least a month due to unavailability of panel.