Airtel — deactivated my sim in a month

Address:

New Delhi, Delhi

Sir i bought a sim last month. I go aboard after 2 -3 day when i return back after 1 month my number not working what i do. I want solve my problem as soon please do something as soon as possible. Is any plan that my activate my sim for a year cause i go aboard regularly.
So i want a data plan which activated my sim for my life time or at least one year.