Jet Airways — Non receipt of refund of tickets

I had booked 4 tickets from jet airways amounting rs.42884/- at the ticket counter of jet airways. My date of journey was 11th may 2019. But the flight was cancelled by jet airways and promised to refund all the amount after completing the formalities. But even after several reminders, i haven't received any refund or any message/e-mail from jet airways in this regard. (It's almost 13 months now.)