Airtel — deactivation of sim without any notice

Address:

Bangalore, Karnataka, 560078

Hi,
I have been abroad for more than 2 months and use my airtel prepaid number for my banking purposes in india. Due to inactivity my number has been deactivated and i tried recharging but it says my number is invalid. I currently have nobody in the circle i used my number in (Bangalore) but is there a possibility that i can do something online? I do not want to go through the hassle of a duplicate sim or a new number.