Hello
Is this where you looked? Please go to https://account.live.com
Sign into your Microsoft account. Then go to Service. Click on Manage for the subscription plan you want to cancel.
Otherwise, is it listed in Order History section and it is not a subscription type?
You can reach out to support to help you cancel and ask for refund too.
To get help, open the "Get Help" app on your computer (just search for it in the Start menu). or go to https://support.microsoft.com/contactus, Type "Billing" and press Enter. On the next screen, click "Contact support" at the bottom of the page, then choose "Windows" > "Manage my subscription". You’ll then see the option to chat with a Microsoft support agent who has access to your account to help review the issue.