Hello, good day and thanks for your question. Sorry to know about this and I understand that you encountered an issue with regards to th refund for Minecraft Dungeons 2.
For this, you can check if you will be able to request it again via the link below.
https://support.xbox.com/en-us/help/subscriptions-billing/buy-games-apps/refund-orders
Reference Microsoft support links: https://support.microsoft.com/en-us/account-billing/get-a-refund-on-apps-and-games-bought-from-microsoft-81629012-aa4f-f48b-2394-8596f415072b
https://www.microsoft.com/en-us/store/b/terms-of-sale
If you will still encounter an issue, you can reach out to the support team at https://support.microsoft.com/en-us/contactus/ and then click on Windows and then click Get Home Support and then type in Billing question and click the blue button that says Sign in to contact Support and login and proceed from there.