Surely after time it is expected that wear occur, and that a colour fading is due to such wear.
If you are talking about the top of the range £500 carbon colour saddle, then I am afraid that even Pagani Zondas have problems with carbon colours fading/clouding (due to UV exposure?).

If the dye had run in the rain then I would certainly agree with you, but as it stands I would request that you post pictures of the extend of the fade/defect.

Edited to say that I don't mean to be too harsh.