UPI refund

I made a deposit of INR 5000 on stake via upi and. Inever receieved the funds

Stake support tells me that after investigation their merchant has not recevied the amount and they recomment contacting my bank and requesting a refund.if the refuse, you may refer them to the RBI guidelines and suit a formal complaint so your case can be escalated to the appropriate department.

I spoke with me bank. And they have told me that the amount has been successfully credited in the beneficiary's account and there is nothing that they can do.

Can someone help me and suggest how can i get refund for it ?