Indigo Airlines — Poor food provided - found very near to expiry after taste not good

Address:

493196

PNR T7C8PY
Delhi to Raipur date 29.03.2017
Against prebook Meal, I have asked Rajma Chawal & Soup.

I found Rajma chawal taste very odd also not absorb water added by staff before serving(after 8 Min).
On checking I found it was packed in Oct 2016 Batch RC.

Indigo staff was informed, but no complaint book provided only offered to give feedback.
Also a mind blowing reply by head of staff that 20 days are still left to being expired.

I feel Feedback & Complaint are Different. If I want to complaint for compensation where should I go? pl inform & compensate.
People claim for a 5 Rs. Road side tea too. but we can't in Indigo Is that so?
Is the indigo staff only there for a decent chat. and provide feedback form?