Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
To learn more about refunds, see https://support.microsoft.com/accounts-billing/subscriptions/how-to-get-a-refund-on-a-microsoft-subscription .
P.S. You should also verify that you successfully canceled the subscription. For more, read the article at https://support.microsoft.com/en-us/accounts-billing/subscriptions/cancel-a-microsoft-365-subscription .