Airtel — airtel outgoing services expired

Address:

600075

My airtel outgoing services has been expired inspite of my remaining balance is 39.46rs. I could not able to make calls but i can receive as of now.

This is the below message which i got for expiry.
"important: outgoing services on your airtel mobile [protected] has expired on 10-nov-18. To restart the services recharge now. Dial *121*51#"

I tried dialing *121*51# to extend the validity but there is no options to extend the validity. I tried to call customer care numbers but that's also not working.

I need immediate resolution or soon my incoming will also be blocked.