Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
1
Log into any Microsoft account you may have on this link.
https://account.microsoft.com/services/
If you find your subscription listed there, click Manage on the subscription, and from there, you can cancel the subscription, also, disable the recurring billing on the subscription to avoid any further payments.
You may then be entitled to a pro-rata refund, you can check your eligibility to a refund using the steps on this link.
2
If you are unable to find the subscription on your account,
Using any Microsoft account you may have, try using the steps they provide on this link to try to find the subscription your payment is for.