Airindia Express - i want my refund

hi my name is paramveer singh shekhawat i have complain about my ticket refund amount i book a ticket delhi to singapore flight date **/**/** because of covid singapore borders are closed on ** april so that's why flight is cancel my ticket number is ************* and after * months i received **** inr for refund but pay for ticket ***** i want my full refund flight are cancel is not my fault my refund reference number is ***********o* is already * months but no one answer me properly air india service so bad next time i can't book flight with air india as soon as possible i want my full refund