Cognizant — Offer letter received but didn't get the job since 9 months

Address:

Mumbai

Hello,
I’m 2020 batch engineering student..I have given cognizant’s exam back in October 2021 and later the interview.. I received the offer letter after all the process in Nov 2021 saying that I’ve cleared all the rounds and will be further receiving joining.
Here I would like to draw your attention and tell you that I didn’t receive any joining letter and job.
I’m highly disappointed since I waited for more than 9 months.
Please help me sort this issue out.
Thanks