Airtel — tele verification of mobile cannot be done

I am not able to televerify my airtel number
I had ported my number from airtel prepaid to postpaid.
On 10th october i received a message on my alternate phone number that my airtel number 85xxxxxx00 is ready for televerification. But no matter how many times i call the number cannot be connected. Tried restarting device... Using another devics.. Nothing helped. I have been trying since morning but no luck.

Could you resolve it asap... Its really urgent.