Tech Mahindra Scrum Master interview questions

Bad experience. I was called for interview on Dec 2017. I have gone through two rounds of interview. I cleared both and HR discussion happened post that. Salary negotiations, project details and notice period were discussed in HR round. Same day they collected all document. Interviewer has given me a task to do in weeks time. I thought, offer will be released in a while and did the task. No feedback given for the task which I have completed. Professional ethics in TechM, OH stop it is a joke there!!!! No response from HR and interviewer for the effort I put in for the task. Bad experience and worst people in HR panel! Better stop wasting candidates time and effort in the name of interview