It may be a bad experience for you. But there were others too with similar expereinces. There was this two UN officials at the request of Indian officials travelling to New Delhi via Mumbai and they were also waiting for a document visa and argued with the unheeding officials and was deported only to be apologetic later by the Indian UN officials. The Indian Officials are over reacting to the fact that India should not be considered lightly at the same time they should be trained to act and behave like human beings or else all those comes to India after leaving india will abuse all of us as bloody indian.
