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, on this link they provide the method to check your eligibility for a refund and to cancel the Microsoft 365 subscription.
Also, while managing your subscription, ensure you disable the recurring billing on the subscription.
2
If you are still unable to resolve the problem, 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