GoAir — regarding refund amount (which is too less) for cancellation of e-tickets for a genuine reason

Website:

www.goair.in

I booked go air refundable tickets (Booking id nf[protected]) from makemytrip site for 26th november by paying rs. 12, 648/- around 3 months back (With the ease of timings of the flight and the arrival terminal shown at the time of booking). Since i need to travel with a senior citizen, changes in the timings and the terminals were very important for us. Recently i received continuous messages & e-mail from makemytrip regarding the reschedule of timings of the flight and other mails regarding change of the terminal for the said flight. Since i need to travel with a senior citizen, the changes are not acceptable to my family and we need to cancel the tickets.
I also found that as per the recent history that this flight is getting delayed daily and reaches only after 11 pm which is not suited to us.
On contacting go air, i found that they will refund only rs. 2548/- out of booked ticket value of rs. 12, 648 which is too less based on my genuine problems of change in timings, terminal and daily delays.
I requested go air to cancel my tickets and to refund a considerable amount which they are not accepting as per their mails.