On their main page they advertise 4,9 euro delivery costs within belgium. And also in the text at the beginning of the delivery costs page.
But they charged 5,9 euro. I created a customer service ticket but they said I had to better look because lower on the delivery page they advertise 5,9 euro.
You can better buy somewhere else because you have to pay for the return coste. They try to hide it by being vague about it.