Cognizant — Cognizant Pending offer letter release request

I was selected in interview process held on 22nd Jun.
On 24th Jun i got hr email that I got selected in technical interview and need to submit further documents for HR discussion.
I sent the required details.
Same day I got hr call with confirmation of joining and salary discussion.
But it's been almost 2 weeks i got no update.
I tried to mail and contact hr person but she was not reachable
Please resolve this.
I'm hoping for positive response.