Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello
Can you go online https://account.live.com > subscriptions, see if you might have two subscriptions. If so, click on "manage" for one of them and cancel it on the next page.
Next, request a refund, 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.