Heavy colour difference after coating at Seat contract factory

Hello guys, recently the front and rear bumper was repainted in my car at a Seat contract workshop. My car is a Seat Leon 5 F FR in white (EZ 05/2014). Background was that one day when I was washing on the rear bumper I noticed that part of the clear varnish was loosened and that the front bumper had hardly visible paint cracks. The damage was examined and approved by a Seat field representative. So far so good. the paintwork I noticed the sharp color differences (see pictures, the color is much stronger and brighter white). I am absolutely dissatisfied, you can see immediately that the car was painted after and for me there is such a significant decrease in value. The problem is that my vehicle was an accident vehicle, which I also said from the beginning. The completely left side was painted after. The result was great and not visible. The paintworker said that the rear shock I think this situation weakens my position, doesn’t it? No one told me about possible color differences, the master said that he would not see any color differences. It would be normal, because the color from plastic to metal always looks different. But the workshop wants to make an appointment with the paintr and the thing about it is that it is not possible for me to change the color. But I’m afraid the paintr won’t take care of it and the fact that I have an accident vehicle won’t help either. What can I do? Reviewer? Don’t misunderstand, I’m fully satisfied with the dealer’s service. Thank you in advance. MFG Iceman