I used to sell retail water plants. Quickly learned to put on tags or codes differently to assure accuracy, i.e., can't remove tag and stick back in pot.
When dividing/potting hundreds of plants each year, yes, sometimes I or workers made a mistake. On the rare occasion something wasn't caught, if I had a complaint the customer received the correct item. Free if they returned the mistaken plant. Because that's how ya keep 'em coming back. Caveat emptor didn't fly at my place.
If we divided or made a mistake and couldn't figure out color, it either went back to grow until we could, or I'd put them on a NOID sale.
There's a local nursery here with the reputation of having a 50/50 chance of getting the correct color if plant isn't in bloom. They don't have near the customer base as the other place down the street.
Having said all that, Dolly's loss is my gain. And I can understand not wanting to fool with contacting the seller for a couple of Tolumnia. Too much hassle. Now a $100 orchid, sure. Or there was that time my dad bought a car, and thought he'd purchased the Oldsmobile. Ummm... Dad, it says Buick on that car.