Cognizant — not getting offer letter & hr not responding

Address: Pune, Maharashtra, 411001

Hi cts hr team (Cognizant offer letter status)
I was interviewed on 22nd september 2018 (Pune), both technical and manager rounds are completed on same day and they told they get back with in 3 days.

After waiting of 15 days one day i got a email in that cis form is attached & asked for salary slips, form 16, photograph etc. I provided all documents & filled cis form that day only & sent to them.

After sent email, again i got a email from cts talent acquisition team on 12th october in that they provided a verification code & a link to fill cis from with upload live photo & attached 1 photo as well & i submitted that day as well & they told me i will get offer letter within 2 days.

Still waiting for offer letter & i sent email to hr & they are responding me back.

Anybody can suggest something should i wait for offer letter or not.