Air Asia — Refund of tickets of flights cancelled by the airlines

I booked tickets for flight from kolkata to chennai with rs13616/- for their flight on 23/05/20. My pnr number was u9c6yh. The flight was cancelled by the airlines and accordingly, on receiving their advice, i applied for giving me credit for the value of the ticket. The airlines acknowledged my application and advised me that my case number is 60317208 dated 20/05/20 and the credit will soon be given.
With deep regret i like to advise nether i have received any credit till date nor they have advised me any progress. They have not even kept their mail open for communication. I am not getting any cooperation from their side.
My air asia big id is [protected].