OYO Business Analyst interview questions

Hiring process was smooth. There were 3 rounds of telephonic interview (3rd one being the final as per the HR). After that no communication from the HR, no response to emails, nothing. It has been a month now. I don't understand the hassle in dropping a single email to the concerned candidate ( or replying to one) who has made it to the final round. Very unprofessional on the part of OYO's recruitment.

I had only one round of interview in which he asked me questions related to R programming, SQL related and two puzzles. After that, he asked me to sit for another round of interview. I got the call from HR at the same that I can leave for the day without and feedback.