Airtel contacted me through the forum asking me to provide them details about me (Hah) as they wanted to help out people complaining on this forum. The email id offered to me was airtelpresence@airtel.in. I suggest mailing to this email id in case your problems remain unresolved.
I had applied to be placed in the Do Not Disturb Registry and received an SMS acknowledgement to that effect on December 2, 2009. There was very substantial relief immediately thereafter even though the SMS claimed to require 45 days to be put into effect.
Now, from April, I'm being bombarded again! Presumably, this is an attempt to get me to phone Customer Care asking why I'm getting nuisance SMSes so they can charge me for those calls.
They also have this habit of autosubscribing customers to services they haven't asked for and then charging them since they didn't unsubscribe.
I've saved all these SMSes for future "use".