I did not receive my reward in epic Pachinko either! I spent 540 Kobans, won the the flower bouquet with the swirl purple background. (Was happy!) but when I went to my inventory at market, it wasn't there! But my 540 Kabans were gone!!!
Update:
After logging out and back in again, the item appeared in my inventory.
Don't know why there was a delay in the process. But problem seemed to resolve itself.