Spice Jet Airlines — Refund of cancelled flight amount in bank account

I had booked my flight ticket of amount rs. 15358.00 from kolkata to goa pnr yii8uh on 05 jun 2020 to join duty on urgent basis and my flight cancelled by airline company spice jet. On asking they credit my refund amount to credit shell and that amount will not credit to my account and they advise me to travel same passenger before 31 mar 2021 otherwise my amount will be lapse. Again i booked ticket for 08 jun 2020 vide pnr mclgyw and again they cancelled flight. Spicejet ariline neither managed my booking in other flight nor refund my amount in my account. Finally i booked my ticket in indigo airline on 08 jun 2020 vide pnr agjnfp and join my defence service. Customer care told me that we will not refund ur amount.
So therefore i request you to plz take necessary step to refund my amount in my bank account at the earliest.