Airtel — To send 'Port out sms' is impossible

I am facing the issue of port out sms. I want to port out of airtel and get into bsnl network. Customer care is telling that only recharging with unlimited plan will allow is to send sms. I don't want to waste 179 rupees just to send sms and get out of this network. Don't know why airtel isn't following government orders. And why do I have a normal balance if I can't send SMS ?!! Open exploitation of poor people by airtel and government isn't being serious about this company's policy. Please make them change this option.