Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Log into your Microsoft account on this link and check if the subscription has been cancelled and also, click Manage on the subscription and ensure recurring billing on the subscription has been disabled.
https://account.microsoft.com/services/
If your subscription has ben charged for, and not cancelled correctly, use the steps provided on this link to cancel the subscription.
Then, if you were charged for the subscription and it is cancelled, you should be entitled to a pro-rata refund, you can check your eligibility to a refund using the steps on this link.