4rot / blue brush ordered because I have 2 children, 4 get ice-blue, you can not tell them apart and are cheaper

I have specially the red and blue ordered because I have 2 children and is important to me that each uses its own brush and you do not constantly interchanged. For this, I was also willing to spend more money than for the cheaper 4 ice blue that all have the same color. Unfortunately, I now get delivered the cheaper and the difference was not refunded course. Since the small printed list of no use, the pointed out to me that there are now 4 icy blue instead 2rote and 2 blue. Because of the brush makes no different in color or not so easily commutable and bring back the 2 euros more not return that I have now paid.