Cognizant Technology Solutions — Didn't receive offer letter After HR discussion

Address:

Pune

Attended interview at cognizant on 9th sept 22 and that day got mail for CIS document submission. As I said in interview, I can join immediately

I have submitted documents, after that on 19th sept 22 had HR discussion in that he discussed offer and designation and said i will receive offer letter EOD or next day, but still it is not received, is is worth waiting ? Because no one is responding to my follow-up mails

How can I conform the status of offer letter,
Please help me with that