As you have asked about the National Insurance Company Limited (NICL) office in Chennai, I am giving you information about it, check below for the details

You can check for its offices in Chennai by using the office locator option.
To use it, you can follow steps given below

Go to NICL website
Click on Office at the top of screen, the page open look like


Here enter the correct details and you will get the information about its Chennai offices.

Contact:
NICL
Head Office:
Address:
3, Middleton Street,
Prafulla Chandra Sen Sarani ,
Kolkata, West Bengal, 700071.
Telephone: 22831705 /
Fax: 22831740.