I do sympathise. I have a front garden pink and white border. I ordered some white gladioli to stand in a clump at the back and they are scarlet! I dug them up and handed them to a friend who has a rainbow border, but they like my soil so much that they bred new corms fast and I still get the odd spike of red. I just pick them now.
Likewise at the very front to the road, I have a beech hedge and planted a large row of cream narcissi before it. Some of them are yellow. Again, as soon as I see that they are the wrong colour, I pick them. But it's very annoying and happens often. Iris reticulata Harmony instead of the Cantab that I wanted - Harmony from three different sources over four years! In the end I had to buy Cantab while it was in flower in a pot to be sure to get the one I wanted.
I think nursery workers don't have the time they used to, to be more careful. It's all a big rush. I speak from experience.