You should apply to have your passport re-issued*.
This FAQ page from the Indian Government, Ministry of External Affairs, Consular, Passport and Visa Division, contains this text:
Passport Services Overview
Q1: What are the various passport services and which form has to be filled in?
A: The various passport services are:
If I am applying for reissue of damaged passport will I get a renewed passport?
Yes, your passport is damaged according to the Indian Ministry of External Affairs, Consular, Passport and Visa Division:
Q1: What is the definition of damaged passport?
A: Damaged passport is classified further based on the extent of damage, i.e.: