i'm looking into that, but out of >100 Codes for that event this would be the first one that not work...
so how to solve this problem ?
you have 100 codes ?
if you still have stock i want your replace, but if no have stock again i want your refund in here please.
It's also other buyer from you not work.

Too late. I bought and they didn't work for me. 
Edited - the seller quickly replaced the codes and the new ones work great!