I gave interview at Microsoft Noida, India in April end. A recruiter then contacted me for documents via mail and if I have any queries , I reach to him on same mail but he never replies.
After waiting for 3 weeks , I was given offer letter to sign in Microsoft Action center saying it expires in 2 days. But the letter had some incorrect information which I again raised query to the recruiter on mail.
But recruiter has still not replied and its been now 9 days now since the offer letter was given.
I have mailed multiple times, but no response.
And there is no contact number of his shared with me, nor any other HR is aligned.

What could be the reason that he is not responding or what can I do in case of such issue. Because of no communication by them, it looks like they could revoke the offer letter.

Any suggestion as to whom should I contact to get any update or complain about this behaviour? and if anyone faced similar thing with Microsoft Recruitment?