Online by card (Visa or Mastercard), through NETOPIA Payments. You pay straight from the invoice page in your client account, and the payment is confirmed insta...
Not using your website or deleting its files does not, by itself, mean that you have requested cancellation of the service. Check your client account for your services, their expiry dates and the applicable cancellation or non-renewal terms. Consider hosting and the domain separately: you may want to keep one of them.
Clearly state which service you no longer want and from what date, then ask for confirmation that your request has been recorded. If you have already received a payment document, ask about its status; do not assume that deleting or no longer using the website cancels it. Automatic domain renewal is on by default, so renewal invoices keep being issued until you ask for the service to be cancelled.