Different shoes

Fitted a size 5 of adidas sneakers last, I fitted the shoe that was on display and asked for that size. They came with one shoe and put the one on display in the box… bought them for my big day, only to find that the sneakers are not the same on the big day!!! Same made, same size but different colours. One shoe was white and blue and the other was white and yellow and on the box it’s written white & blue… I need this fixed!!!