The recurring billing feature is switched on by default, meaning you'll automatically pay for a new subscription period when your current period ends.
You can switch recurring billing off and back on through your Microsoft account or from your console. Learn more about stopping recurring billing at Microsoft Support.
If you did not want to be charged for recurring billing, but failed to switch off recurring billing before your payment was processed, you’re still entitled to a refund of your most recent recurring billing charge if you cancel your subscription within 30 days after payment. This refund right is limited to one time per Microsoft account, per subscription product. You can submit such a refund request to our Support team: Request a refund.