Hey there! Nice to meet you!
Based on your description, kindly follow the guide on the official Microsoft website to investigate and locate the charge from Microsoft on this link:
https://support.microsoft.com/account-billing/how-to-investigate-a-billing-charge-from-microsoft-398c5328-364c-d5e4-ea8f-f5ad60562a93
If you're able to find the transaction and if this happens to be a forgotten subscription renewal, you can check if it is eligible for a refund through this link:
https://support.microsoft.com/account-billing/how-to-get-a-refund-on-a-microsoft-subscription-67dca30b-b323-44d5-acc2-e02f9902c472
If you are unable to find the transaction in all of your accounts, you'll need to contact your financial institution/bank directly to dispute it, and they may process a refund, as this would be considered a fraudulent charge.
You may also need to have your card blocked.
Thank you for your understanding! Please let me know if you need anything else.
Best regards,
Darhyl