Cognizant — Not yet receive Offer letter

I am writing to you regarding my offer letter after giving the HR interview round.

I had done my first technical interview on the 17th of august 2022 and an HR interview round with one HR on the 18th of August 2022. After 2 days (20/08/2022) I received an email from HR to fill out the Candidate Declaration Form-2 (CDF-2), and another Hr called me on 22/08/2022, she is saying that you have cleared all the interviews and filled out the Declaration form and submit. I sent declaration form-2 on the same day. After I am trying to reach out to HRs, they did not pick up my call and not responding.

The HR is not responding to calls or emails. I have refused other offers due to Cognizant and I am an immediate joiner, relieved from my previous company last month. I hope this mail is helpful to me.