Airtel selling customer Email address

Recently i signed up for airtel broadband service. While registering they asked to give my personal email address. I thought, AIRTEL being an responsible company will keep customer information confidential. So i gave them my personal mobile number and Email address (Which i have never used for any other internet signups).

But airtel doesn't see it that way, they find it another source of revenue. They make money by selling customer information.
After i registered for there service, i have started recieving lot of advertisement calls in my mobile. An SPAM Emails in my inbox all relating to the particular locality i live in.

All my complaints to customer care to remove my mobile number from their marketing rolls falls into dead mans ears.

I am not sure what should i do now.Should take them to the consumer forum for making money by selling confidential information.