If I remember correctly, you had to buy it on ps3 and could transfer it to ps4 for an additional $10, and there was a deadline to do this. It may just be that your attempt at doing so ended up being past the deadline that they had set, meaning now people have to pay full price to have it on the ps4 even if they have it on ps3.
I apologize if someone has already wrote this as a response, I didn't feel like reading all of the posts.