That is how Costa operates they are a wholesale nursery even if you got a hold of a person they would not do anything about it .
I had several Dends. given to me a friend got them from the discount table what you described is exactly what they did hacked up a big blooming plant and stuck it in a pot with other pieces .
I have talked to the people at Lowe's did not do any good I think they have a contract with Costa . Costa does this sort of thing all the time they are well aware of the practice .
Your best bet is to take a picture of the blooms post them on the forum, get the name of the cross and look for another one from an on line source .
I would take it back that is about the only recourse there is
.. When I see the Costa name that is the end of a sale to me .... Hey! Beelady I just noticed u are in Mo. 2 .. Gin