Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
I recommend first investigating the charge by visiting https://account.microsoft.com/billing/payments and signing in with the Microsoft account associated with the purchase. Go to the payment management section and look for the Investigate option next to the unrecognized charge, then follow the on-screen instructions to review the transaction details.
If you need further assistance, here's how you can contact a Microsoft support agent:
Click this link: https://support.microsoft.com/contactus/
Sign in to your Microsoft account.
Select Microsoft 365 > Click 'Get home support'.
Type "Chat with an agent" from the text field and press Enter.
Click "Contact support" at the bottom.
Select the product you need help with.
Follow the prompts to connect with a live agent or request a call back.