The return form on the site didn't give me the possibility to send it back. I wrote to the customer support and asked to help me. Sent a screenshot as requested, just to be told "actually you are trying to return the product after the 14 days delay ". Not true, screenshots sent. They should know it, tracking of the parcel and my very first mail are traceable from the site.
Called a few times, left a voice message. No response for now. Given it's Friday pm, it's probably over for the week.