Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello,
Was it purchased directly from Microsoft? If so, 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.
You can reference this detail step by step instruction with screenshots I posted in this thread: https://learn.microsoft.com/en-us/answers/c/2714817
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If it was via Google Play on your Android device, then you need to cancel from your Google account and request refund from Google, not Microsoft.