If you subscribe on the web, consumer law in the EU may give you a right to withdraw within 14 days. Because Premium is available immediately, the checkout asks you to confirm how this applies to you. The exact terms are in our subscription terms page, which is the controlling text.
To ask for a refund of a web payment, contact support with the email of your account. We reply with the outcome and, if approved, the refund goes to the original payment method.
Cancelling stops future charges: see cancel on web. This page is information, not legal advice.