Airtel — not giving porting code

Address:

Kolkata, West Bengal

I am using airtel prepaid kolkata sim and recently i moved to bamgalore. Now i want to port my airtel kolkata no. To airtel karnataka. But i am not geting porting code in my airtel kolkata no. After repeated sms. While contacting customer care they told that porting code has been generated whereas i have not received any sms. They also told that you cannot generate porting code within next 15 days. I tried after 15 days but again i got no code.