Rspt'd Sir / Ma'm On 18.03.11, Friday, I had made a request by calling airtel customer care centre to kindly activate "Do Not Disturb" in my airtel cell no. 9958525860 in order to avoid unwanted / unsolicited telemarketing calls and constantly annoying promotional offers in response of that one message was recd by me giving my call Request Ref. No. i.e. RDREG40318552785 and second message giving Registration No. i.e. W1039123875 with written words that "allow 7 days for the changes to become effective". As promised... read full review »