Cognizant — I got a call from cognizent

Address: Darjeeling, West Bengal, 734009

I got a call from cognizant chennai[protected].
They told me to come for office but i won't trace out exact location. I am trying to call the same number the number is continuously busy, so any one please send me the exact address please it is very useful for me.
Any one please help me to trace the exact address and find to get it i am very thankful.