QueueBuster interview questions

I crack 1 st round as well as 2 nd round even interviewer feedback was positive but hr didn't bother to provide feedback to candidate such a unprofessional behaviour .After calling hr to know the feedback i got update on mail that i am a great asset for a company but they can't offer me don't know what happen such a rubbish company wasted time of candidate . I guess they hired someone else through reference Worst company ever i have been to for interview. Please guys

Interview level was good , they took two rounds . In the the first round they asked good concepts of javascript . In second round they asked basic DS programming questions.