Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
You can use the AI answer/instruction to cancel it first.
Typically if you just subscribed it, especially by mistake, you can request a refund, but talk to billing support, explain it to them.
Use this method to get in touch with them:
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 "Microsoft 365" > "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.