Miscellaneous topics that do not fit into specific categories.
Log into any Microsoft account you have on this link (https://account.microsoft.com/services/) and check if there are two separate Microsoft 365 subscriptions, if you find two subscriptions, you can cancel one of the subscriptions using the steps on this link.
If you are unable to resolve the duplicate payment problem, this forum is just a user to user forum, no-one here has any account access, you will need to contact Microsoft Support directly, 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