Air Asia — Credit shell refund without my consent

I had booked tickets of Airasia airlines on 27/02/2020 for my to and fro journey form Delhi to Kolkata scheduled on 21/03/2020 and 23/03/2020 respectively.
My Bookings was using IRCTC(air) website, for the same transaction ID was [protected] and booking for onward journey (PNR - YUW4PI) and for return journey (PNR- NVHN9C)
My both PNR were converted into the credit shell of amount Rs. 9387/- on 07/06/2020 and Rs. 6573/- on 17/09/2020.

On 28/01/2021, I received message on mobile that my credit shells have been refunded. But the amount refunded was Rs. 7373/- only. Plz clarify for approval and amount of refund amount of credit shells.

Thanks and regards

Anil kumar
mob. no. [protected]