Cognizant Technology Solutions — offer letter not received - interview on 7th july 2018

I attended an interview at cts - varalakshmi tech park, chennai on 7th july 2018 and cleared all the rounds. At the end hr informed me that i will receive my offer letter within 15 days but i haven't received yet, it's been more than a month. Meanwhile i received an email from cts tag that my interview status is under review. I sent so many emails to hr and candidate response, but i haven't received any reply from them.

Cognizant team,
Please let me know the offer letter status.