Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hi NTJM,
Thank you for posting. You may please refer to the article and follow the steps to check the unexpected charges How to investigate a billing charge from Microsoft or MSbill.info
Here is the link https://support.microsoft.com/contactus to contact the dedicated Microsoft 365 Family/Personal billing support team they will further assist you.
Moreover, if it is related to Microsoft 365 Business subscription then we would suggest you please contact our dedicated billing phone support team for further assistance. For your reference official article about Global Office 365 Business Phone Support numbers. See Ways to contact support for business products - Admin Help
Your patience and cooperation will be highly appreciated. Have a nice day and stay safe!
Best regards,
Shyamal