Guys I checked with CC. The CC girl told me that old registrations are obsolete now, that is why my login ID is not working. She asked me to apply for a new registration via a form which requires a photo as well as Photo ID proof! She sent me the form through email. She told me to print the form and submit the filled form to either Airtel Relationship office or courier it (No drop box option!)I then checked for the new registration on "airtel.in" site itself. Guess what - that also presents the same form to be printed, filled and sent (as CC told me before)!So I have now applied for the registration today. As per form, I should be receiving a new login ID and password after 4 days.