Airtel — about port out code

Address:

New Delhi, Delhi, 110060

I was from kerala and presently i am studying in delhi. There is no network for airtel services at my place and i temporarily want to opt other services. Eventhough im sending text stating port my 10 digit mobile number to 1900 and yet it reply’s me the same stating u have sent an incorrect code. What do you guys think, am i stupid or # to send incorrect code that many times. Look into my problem