how do I correct a double billing for my microsoft 365 subscription?

Hey there! Nice to meet you!

Based on your description, kindly confirm the transaction details first by signing in to all of your Microsoft accounts in order to locate the second charge on account.microsoft.com > Order History > select the date range when you received the duplicate charge.

If it doesn't show up, the charge may have been from a family member or a friend who might have your payment card added/linked to their accounts. Please check their accounts' Order History.

You may follow the guide through the official Microsoft website to investigate the charge from Microsoft through 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, 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 Microsoft Support for further assistance, as they have the tools and resources to properly investigate this:

https://support.microsoft.com/home/contact?SourceApp=smc2&ContactUsExperienceEntryPointAssetId=S.HP.SmcContactUsLanding

Type "Duplicate charge" > Sign in to contact Support > Microsoft 365 and Office > Billing and Payment Updates > Confirm > Chat with a support agent in your web browser

Phone Support: https://support.microsoft.com/topic/customer-service-phone-numbers-c0389ade-5640-e588-8b0e-28de8afeb3f2

Thank you for your kindness and understanding! Please let me know if you need anything else.

Best regards,

Darhyl