Cognizant — Yet to receive welcome mailer

I got my joining date from cognizant on 05/01/2022 but could not get welcome mailer from where I can accept the offer letter. Later got renewed offer letter with 13/01/2022 and still I did not receive the welcome mail/any kind of link from where I can accept the offer letter.

I am not getting any response from cognizant for my mails.

Can you please check on the issue as tomorrow is my new joining date