In Connaught place, Delhi they have a Headquarters. There you can file a report against Air India. Otherwise file an FIR in the nearest police department.
However this does not help since in India - you are doomed to die after food-poisoning and bad conditions even aboard Air India. The Indian cooks touch their balls while cooking and the food is partially eaten by monkeys and rats directly from the pots.
Thus there is no sense of reporting something, since in an average it takes 402 days for an Indian court to review your case, if it finds it genuine, of course.
Source(s):
Jawaharlal Nehru University - Gangha Dhaba and Sabarmati hostel and Narmada hostel mess.