Myntra.com — Wrogn Men Black Jeans AND Wrogn Navy Blue Shoes

1.I purchased Wrogn Men Black Slim Fit Mid-Rise Clean Look Jeans from myntra for Rs.1028 and due to the size issue i returned my order .Order was picked up on 10/09/21 and they said that refund was initiated too on same day by paytm UPI(same source) .But it is been 20 days now i didnt get my refund. They provided me a reference no. but it is invalid when i checked with my bank.

2.I purchased Wrogn Men Navy Blue And Green Printed Espadrilles from myntra for Rs.923 and due to the some issue is returned my order .Order was picked up on 12/09/21 and they said that refund was initiated too on same day by paytm UPI(same source) .But it i been 18 days now i didnt get my refund. They provided me a reference no. but it is invalid when i checked with my bank.

Please help me with these two payments mentioned above.
Everytime i call them they ask to contact bank with this invalid reference no. they have given.
A reference no. is a combination of digits only.
But they have provided me this 50ef8695-ba91-4f66-b95f-3b7287fac2cf for Rs.1028 order.
Please Help!