I purchased on Cdiscount what I thought were white bedsheets. I received two black bedsheets. I contacted the site, and they responded that they could change the sheets, but all return costs would be on my account. I checked again on the site, and realised that there is no description of the color you order, except for the pictures which show different color. As I am positive I clicked the right color, it seems there is either a problem with the Cdiscount site, or the seller chooses which color they want to get rid of (black being an obvious choice, as they really look horrible).
The main issue is the poor service from Cdiscount - easy to blame the customer - other companies, in the same situation, do not bother arguing, and swap the products.
This also showed me that once you opened an account with Cdiscount, you cannot close it on line.