Airtel — phone lost - need to block sim -

Address:

560037

My name is krittish ray chaudhuri.

Today morning when i was travelling in bus, my phone was picked up from my pocket, this happened some 2hours ago. Thus i would request you to block my sim.
Do i need to go to airtel shop for filing a physical complaint?
I will be highly grateful to you if you can take the required steps for blocking the same.
My phone number is [protected].