Airtel — incoming calls not working with the 2999 pack for usa

I am now currently in us and i have subscribed for the international roaming pack of 2999 but still am not able to make any outgoing calls to india. The calls are not placed at all. I am able to get incoming calls and use the data roaming but not to place any calls (Outgoing call)

Kindly check and rectify as soon as possible. As this pack is for 10 days and if the rectification takes a longer time then there is no use of this pack.