Cognizant Technology Solutions — joining letter not received

I have tried to contact from the person who has sent me call letter but i haven't received any response yet. I was given interview with cognizant on 4th august 2018. Same day i was confirmed by hr that i will receive my offer letter with in next week. But still i am waiting for my offer letter. Please find the attached confirmation mail. Below is the information about me.
Name: shiva kumar
My email id: shiva. [protected]@gmail.com
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Hi Shiva,

I Have attended and gone through my interview in CTS on August 4'th for Hadoop/Spark developer role, Thoraipakam, Chennai and on the same day, I was confirmed by HR that I will receive my offer letter within next week. After one week I got a review mail from Cognizant TAG that " my application is under review will get back shortly within 30 days".Its been 49 days I didn't receive any offer letter. waiting for the offer letter.

I am not sure whom to contact regarding this.
Naina P's reply, Oct 11, 2018
did you get any update from CTS and have you filled CIS form ??

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