Is there full moons? Over halfmoons and halfmoons.. some people/stores call them "full moons", but there is no actual "full moon" betta classification..
Granted, HM females don't always have a 180 spread and can carry the genes.. but paired with that male it will be a slim chance at getting a proper halfmoon from them.
You were scammed sadly.. topline is rough, not a "moon" of any type and their scaling is so thick they are starting to lose their eyes.
I just purchased today 2 pure true white HMPK/HM pair for $30 that is from a line of show quality fish.. female and male both smoothe topline and both 180* spread.. purchased from an American shop who gets them direct from IBC show judge breeders in Thailand so I skip transhipper fees.. high quality fish that are beautiful don't have to be expensive. Just have to take the time to look around, don't grab what you first see.. find reliable places/breeders and work out deals, etc.
These are great pet fish, whites are very pretty.. but what happens is with poor stock, or issues such as the eyes and fin type, you decrease the amount of potential buyers.. People who want pets will want to pay less for the fish, and tend to only get one.. possibly two to make shipping worth it. But a big section of the people who are willing to spend money, and who are willing to buy multiples are breeders and showers.
So, if you are aware that you may have to cull a bunch due to the scaling over the eyes, and you may not sell as many because not a big fan base for deltas, nor are they worth as much.. then go for it. Good practice at breeding/raising fry. But in the future make sure to shop around, find other places to purchase from, breeders, etc.. Facebook has many clubs/groups out there with breeders who often sell for cheap.