Airtel — international roaming services

Address:

560087

Hi all,
I am on international roaming to usa and airtel incoming and outgoing services are not applied on my airtel phone number ([protected]). I have activated my international roaming pack on the mentioned phone number and complaint to the airtel customer service but seems they are not listening to there customer.
Please help me to get addressed the issue on priority as the ir packs already activated on my phone number for zone b but still i can't make any outgoing calls and receive calls.