Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
1
Log into any Microsoft account you may have on this link.
https://account.microsoft.com/services/
If you find the subscription linked to your account, click the manage button beside the subscription.
From there, you can cancel the subscription and also ensure you disable the recurring billing on the subscription to avoid any further charges.
2
If you are unable to find the subscription, using any Microsoft account you may have, try using the steps they provide on this link to find out what that payment was for.
3
If you are still unable to resolve this 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