Airtel — airtel - help desk unable to trace my number

I have lost my mobile phone with airtel simcard. There's no email registered and i call using my other airtel number - the airtel executives are not able to fetch any details about the mobile number although i have been paying bills every month including the one for last month.

I have sent emails to [protected]@airtel.com but i only get an auto reply saying that the mobile number is not registered.