Firstly, you'll need to ask the store itself why they chose to continue selling a game with expired codes as new. Stores purchase their stock from the production companies; after that point, the store resells that stock. The store owns all of the copies that it was welling, including the one it sold to you. Secondly, Bungie isn't hard to get hold of, the forums here are a great place for support, and much faster to give a response than a ticket system would be, considering how clogged a ticket system would be with random and mostly unnecessary issues, many of which already have answers. Lastly, unfortunately, no, neither Bungie, Activision, Sony, nor Xbox will replace your expired code. You'll need to purchase the licenses of the relevant DLC from the platform's digital store. There are no other physical copies of Destiny 1 with working codes, and there are no more valid codes to give.