Delhivery — No refund for failed COD payment

Recently I booked a COD order which was delivered through Delhivery

When I tried to make payment to the delivery person via the payment link shared to me by him, the transaction failed but of Rs****/- debitted from my account.

Later I paid Cash to the delivery person and received my courier.

I also got a message regarding failed transaction as below from Delhivery

"Oops! Payment attempted through payment link for AWB(s) ************* failed. Any amount if debited from your account will get refunded within *-* business days. - Delhivery"

But no refund received to my account till date.