HR Interview with simple questions and english check + Technical/Consulting Interview that took 1 hr. Questions incrementally harder and description about your solutions built in the past + very deep questioning your solutions.

First I had a telephonic interview. After clearing that interview they had called me for the f2f interview and then I attended the written round. I have cleared all the rounds and on the very next day they called to submitted all my documents so that they can release my offer letter so soon. But now its 5 weeks has been completed neither they released the offer letter nor they had called me single time. And now the condition is that HR don't reply on my mails so I am very disappointed by this. At least I deserve a single call or mail regarding my profile status.