Sorry to hear that you're having trouble with this situation. Could you please let me know if you're able to sign in with that Microsoft account at the following link?
https://account.microsoft.com/billing/orders
If you're able to sign in, please check whether the purchase of the game appears in your order history.
If you're unable to sign in, please share a screenshot of the error message you receive, without sharing personal information, so I can better assist you with this situation.