Tech Mahindra Manager/In interview questions

I got call from Tech M HR for the interview. Interviewer joined late and then he asked few questions related to my work and past experience. Next day I got selection email from tech Mahindra that I got selected and I have to submit documents. So I have submitted the documents next day. After few days, I got call for HR discussion. HR told we will send you the offer. But I did not receive! I also emailed them asking about the update. But no answer. I also called her. But her phone was switched off. Then after few days, recruiter emailed that they hired internally. They don't need me anymore.

three rounds of interview, technical questions around DWH, cloud , design scenario based questions, people management related questions, scenarios on people management, final HR round for salary discussions if ll goes well