Invenergy interview questions

Not professional interview experience. HR rescheduled the initial phone call for THREE times in two weeks ! Asked for a whole day onsite interview. All interviewers and HR were all friendly. Some interviewers had no idea of job responsibilites. Follow up calls from HR for couple times indicated a positive sign. However, everything all suddenly ended quietly. Not even formal rejection email. No one wants to work in a non-professiona environment like this. Also, even this is a tech role. But no tech question was asked ! But only behaviour questions. Wasting time for everyone.