Cognizant Technology Solutions — Not issuing onboarding pass

Hello Team

My previous joining date was 01 March 2021. Also for background verification, I had deposited all my documents and concerned letters on the onboarding portal in Feb 2021 and I have been let down by your hiring process for so much delay.
For joining your company on an immediate basis I had resigned my current job on 26 Feb 2021 and expected to be onboarded in your company earlier but on 01 March 2021 same excuse was given to me. After that my joining date was postponed to 15 March 2021 and again pushed to 22 March 2021 and again pushed to 26 April 2021 but the same excuse was again given this time as well.
before the date of joining I am getting calls from different peoples belonging to CTS from the Candidate Engagement, Partner team had confirmed that days joining on telephonic conversation. But still, I have not availed of an onboarding pass
It is a very unpleasant experience for me from such a reputed organization.
Could you please let me know the exact date of joining with the onboarding pass? Also, can this process be performed parallelly after joining or can you let me know the latest when this process shall be completed?