This is a scam; they sneak in other, expensive, products in your purchasing form and the website is unavailable when you want to end the trial period.

To anyone considering to glide Iberia.

It was unclear to me that when you did not react within 15 days that not only the order would be prolonged (alas), but additionally the free trail for appr 4 pounds (ie only shipment) would become a full order for about 80 pounds.