Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
1
This forum is just a user to user forum, no-one here has any account access.
Try using the steps provided on this link to cancel the second subscription and get a refund.
2
If you are still unable to resolve the second subscription payment, 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