Did they give you a reason for the substitution? They technically are not allowed to do this without your permission. It does not sound like a good breeder to me. Did they give you a rebate on the fish that you did not want? They should not charge you as much for a replacement fish as they one you ordered.

Sorry but this type of thing happens too often when they put a fish up for sale then decide they do not want to sell it for "one reason or another" If it was purchased through either aquabid or ebay I would let the site know as that vendor will not be allowed to sell there for a while as this is against the rules. The fish you buy is the one you get or you get a refund.

This is one reason that people buying online are less likely to trust the few really good breeders that there are. There are too many of these types of things that go on.

May I ask what the name of the breeder is that is supplying this fish?

Rose