ICICI Bank — Payment made, service not received.

Details of payment:
Payment to icici - eazypay
Pay for
Fees payment done by Paytm Payments Bank account.( 500/-rs.)
Payment Method: UPI
UPI Reference number[protected]
Date: 06/12/2023

Sir, my issue is regarding to failure of payment. On Date- 06/12/2023, time- 03:34 pm, my account balance is deducted while making a payment for Delhi university Marksheet claim request, School of Open Learning, North Campus of Rs. 500 through eazypay - icici gateway.
The thing is, I haven't received any service for the payment I made. I contacted my bank for chargeback request but it got declined by the merchant on 02/01/2024.
Now, I need help with this issue I'm facing, I want either my marksheet or my money back. I hope you understand my concern. Thank You.