Cognizant — not getting offer letter after selected

Hi,

Please help me out in below.

I have attend the interview on 11-may-2019, i have completed all the rounds and hr discussion done on same day. Since i was instructed like i will be receiving the offer letter within 10 days. Hence i am not received any offer letter so far.

27 - may -2019 : i got the online cis form to submit - i am done with that
22 - may-2019: i got the email states that "cognizant interview status - select". Hence i have written couple of email to hr. However, i didn't get the offer letter or any call from hr team.