Ok, it seems like they have fixed it, I finally bought the PTFE for €15 + 6.25 shipping + taxes, this is a better price.
Any way I am a little disappointed of ultimaker, they haven't responded my support ticket after 3 days. I am not asking for an immediate solution, just a little attention like:
"We going to check your case but right now we are really busy but we will try to give you a solution asap."
With that I can wait even a week because I would know that they have read my request and NOT, the auto response doesn't count.