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 will see the Email address of the Microsoft account you use for Office, note that down
2
Log into any Microsoft account you may have on this link. https://account.microsoft.com/services/
Do you find another separate subscription linked to any of your accounts?
If so, click Manage on the extra subscription and form there, you can cancel the extra subscription.
3
If you are unable to find and cancel the second subscription.
This forum is just a user to user forum, no-one here has any account access, you will need to contact Microsoft Support again and quote your previous support case number so they can continue to troubleshoot this problem for you, try using this method to contact their support.
Go to this link: https://support.microsoft.com/contactus
Select Microsoft 365
Click 'Get Home Support'.
In the box provided, type billing.
Press Enter, then on the next page, scroll down and click 'Sign in to Contact Support'.
Navigate to Microsoft 365 and Office - Manage my Subscription.
Select the 'Chat with support agent in web browser' option