All of a sudden i received the following sms: From: AD-airtelMOTime: 12:17:58 29-03-2012Message center: +919810051736Message: "Your airtel mobile has been deregistered from National Do Not Call registry. Promo Communication should start within 45 days from today."I certainly did not request to do it. Now who the hell requested for the deregistration? How can I teach airtel a lesson?