We do appreciate your support. We are happy to share a satisfactory result with everyonewe here. If the real customer agrees, then we will share the refund receipt.
No need. I can see that you have made a full refund to the customer and the transaction is already visible on the blockchain:
https://blockchair.com/bitcoin/transaction/5b9599e75894c8cbc49da120d23e4143890ff5f702ca92b3224da7631d18c02dAs far as I'm concerned, case closed. Thank you for being professional about this.
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The refund was confirmed by our real customer.

https://imgur.com/a/uV0VBCr
Thanks again for your attention and support, we do appreciate it all.
We will further remind our customers to prevent fraud, and we will upgrade the security of emails.
Please never trust any fake admin who PM you.
Scammers are everywhere, we cannot eliminate them but we can avoid them.
Good luck to all the nice ppl, cheers!