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 to try to find the subscription.
https://account.microsoft.com/services/
If you find the subscription on any Microsoft account you may have, click the Manage button beside the subscription.
From there, you can cancel the subscription and also disable recurring billing on the subscription to avoid any future payments on the subscription.
You may then be entitled to a refund, you can check your eligibility to a refund using the steps on this link.
2
If you are unable to find the subscription on any of your Microsoft accounts, 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