Duels bug card pack

When trying to choose my 3rd pack of cards, one of them is empty. I chose the empty pack and my deck was left with 27 cards. I would like to have a refund from you, since I made the pre-purchase of the moon fair. Thanks and best regards.
I have the corresponding screenshots if necessary. Thank you

the empty card pack exists specifically as an option if you dont want to add more cards to your deck