Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hi Thomas,
Log into any Microsoft account you may have on this link:
https://account.microsoft.com/services/
You should find the subscription listed there, click the Manage button beside the subscription.
From there, you can cancel the subscription, and ensure you disable the recurring billing on the subscription to avoid any future payments on the subscription.
Then you cancel the subscription you may then be entitled to a refund, you can check your eligibility to a refund using the steps provided on this link.