Vodafone India — Deactivation of vodafone sim no.[protected]

Address:

Kolkata, West Bengal, 700075

I misplaced the sim card form my wallet, possibly i dropped it somewhere unknowingly about 10 days ago and now i have come to know that someone is using the same number. I want to deactivate the sim as soon as possible to avoid any untoward incident. I am about to lodge a police complaint as well about the lost sim but it would be better if you can block the sim asap since someone has got hold of it and is already using the sim that is registered under my name.