Cognizant — not yet received doj

I was interviewed by cognizant in february 2019 and got selected, i'm happy for that. I have received my offer letter in july 2019 and asked to complete pre-joining formalities. I completed everything and i got mail from c2c on september 20th, 2019, that i'm a part of active pipeline. Its already 4 months completed after receiving offer letter. Like me there are so many people are there who are waiting for doj.