Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
1
Log into your Microsoft account on this link:
https://account.microsoft.com/services/
There, select the Microsoft 365 subscription and click Manage.
You can then cancel the subscription and also ensure you disable the recurring billing on the subscription.
You should then be entitled to a refund, you can check your eligibility to a refund using the process on this link.
2
If you are still unable to resolve that payment 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