Punjab National Bank [PNB] — Refund not processed (Transaction dispute)

I ordered Athena overcoat and Sheotopia boots from Myntra on Dec 20, 2022 but due to some reasons, I'd cancelled my orders. So, my refund was initiated through UPI by mantra on Dec 23, 2022 but is not reflecting in my account till now. My total amount is 3681 rupees. I've contacted to Myntra so many times but they are saying that I've to contact bank for this refund. I've been visited to bank also but they are saying that for this problem you have to contact from Myntra. I had complaint on CGRMS also . Response received by them is attached. Please solve my problem ASAP

Amount- Rs. 1099.00/-: Bank reference number[protected].
Amount- Rs. 2582.00/-: Bank reference number[protected]