Cognizant — offer letter not received and no updates

Address: ICC tower SB road cognizant, Pune, Maharashtra, 412105

I have given interview in cts icc tower pune on 27 april 2019 and i cleared all the rounds and hr told i will get offer letter in two weeks or max three weeks.
But even after a month i have no update from them they asked to fill cis online form. Last week that's all no other update
And no one is even bother to reply... Not. Good culture at mnc level