Cognizant Technology Solutions — Not Received offer letter TCS

I have completed my interview on 29th Jan 2022. And completed hr discussion on 31st Jan.
I have submitted CIS form on 1st Feb 2022.

It's been 3weeks since i submitted CIS form and I didn't receive any reply or offer letter from them.

I tried contacting HR but they are ignoring my calls and messages.

I'm trying to know whether I will receive offer letter or not. If yes what is the expected waiting period