Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
You stated that you turned off recurring billing. Did you also successfully cancel the subscription (see https://support.microsoft.com/en-us/accounts-billing/subscriptions/cancel-a-microsoft-365-subscription)?
The "rules" for refunds are explained in the support article at https://support.microsoft.com/accounts-billing/subscriptions/how-to-get-a-refund-on-a-microsoft-subscription .