Air India — missing flight for deaf passengers without proper announcement

Website:

www.airindia.in

Sir,
I booked three air tickets in ai 263 flight for 10 feb 2018 from new delhi to trivandrum (Airline reservationcode h2lky airline reservation
Code z0l26 class economy). Two of the passengers were deaf. We reached the airport terminal 3 at 3.45 am. The cab bill is the proof for this. As the queue was long we waited and reached the counter at 4.10 am. The gate was closed by that time. No proper final call boarding was announced. The ai staff asked me to contact supervisor fast and he didn't help us in any way. I have to run from one counter to another in search of the supervisor and reached him at 4.30. We missed the flight and have to rebook in same flight next day. No empathy was shown towards the deaf passengers. Also all the displays showed that 'the boarding gate will be closed 20 minutes before the flight departure time.'this means that the gate will be closed only after 4.45 am so i kindly request to reimburse the air fare of our cancelled tickets.