Airtel services

I have faced issues with Airtel ever since I have landed Bangaklore in Oct 2006 right from getting a number till 2 days back when they have deactivated my number. I have written emails to the Nodal officer Karnataka, other Senior executives and even to Mr Mittal. No actions taken from their end and they has been continously harassing me. Even the customer care executive once called me Bloody North India. I do believe Airtel has taken all their Customer for granted and its their policy to harass people. They have deactivated my number and result of that is a serious medical emergency missed out and also causing personal and professional problems to me.