Managing and scheduling events and meetings using the calendar in Microsoft Teams Free
This Forum is just a user to user forum, no-one here has any account access, try using this method to contact their support to cancel that subscription and get a refund.
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