Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
1
Open Word, then go to File - Account.
On that window, you should see the Email of the address of the Microsoft account you are currently using for the Microsoft Office apps, be sure not to cancel the subscription on that account, or you may loose access to any files stored on OneDrive on that account
2
Using any other Microsoft account you may have, log in on this link, do you find a Microsoft 365 subscription listed on any other account?
https://account.microsoft.com/services/
If you do, you can use the steps provided on this link to check your eligibility for a refund and cancel the extra subscription on that account.
3
If you are still unable to find the second subscription, and you are being charged for a second subscription, try using the steps they provide on this link to find out what that second payment was for.