Cognizant Technology Solutions — Onboarding pass issue

Address: Chennai

I was given joining date as 23-Aug-2021 but it was deferred four times due to onboarding pass issue in portal- 31-Aug-2021, 03-Sep-2021, 06-Sep-2021 and 13-Sep-2021. I was not sure this was fixed or not. Every time I contact my coordinator she was not responding but after 2 days I will receive updated offer with new joining date. I am sure how to approach and end this. Help appreciated