Air India Express — Refund of Ticket Charge

I booked an Air Ticket from Singapore to Tiruchirappalli (Booking Reference - S096MA)on 03 November 2021 for myself, my wife and child. But I changed my mind and cancelled the ticket the next morning, which is 04 November 2021. Even though I cancelled before 24 hours of booking, The refund amount shown was $217.50. I am coming back to India due to loss of job and It is really disheartening to see that they are deducting $1008 as penalty fee.I received and email from the nodal officer stating that I am not eligible for the refund of full amount and I am only elgible to receive $217.50. I cancelled the ticket within 24 hours and the booking was for 19 November 2021. There is no loss for the airline.Air India express can deduct the cancellation fee. I am ok with it. In the air ticket they haven't mentioned that the ticket is VBM/repatriation flight and the fee is not refundable once it is cancelled. They have mentioned everything about the luggage and other documents needed but this serious thing about the refund of ticket fare they haven't mentioned. If they had mentioned this atleast in the air ticket I wouldn't have cancelled the ticket. Please take the necessary action to refund the amount.