Indigo Airlines — Boarding not allowed even when at terminal 1hr before departure

Address: New Delhi, Delhi, 110022

PNR SGVY2U, flight 6E4677, mother wife & 2yr son denied boarding even when they reach T1 terminal 1hr before departure time, they were made to wait for 35mins in Queue & then denied boarding. It was bcos of careless indigo staff that my family was not allowed to board. Now instead of compensating they are simply not taking responsibility. Request tht the airline own up their fault and inadequate service. For which they should compensate us by giving us full refund and tickets to Bangalore on the as early as flight possible.