A Microsoft file hosting and synchronization service.
Log into your Microsoft account on this link.
https://account.microsoft.com/services/
Do you find that subscription listed there, if so, you can check your eligibility for a refund and cancel the subscription using the steps provided on this link.
If you do not find the subscription listed there, go to the Payments and Billing section on your account, do you find the payment for the subscription listed there?