Butterfinger Promo (Chocorpokkur Mount)

[Skivvy]

a friend who bought the same thing as me (lives in the same place as me) have accepted the receipt (and it is also shown in euros and dollars, and puts the name of the article in Spanish)

Not sure what to tell you in that case. From what I've read, it doesn't appear that yours nor your friend's item should have been approved if going by their "participating products" list. Are you positive it's 100% the exact same item? Maybe they just got lucky and someone passed it through by accident.

And just as a disclaimer, I have not read the entirety of their rules and know nothing of the actual process for how they're approving/declining codes. I'm not claiming that my comments are absolute fact, but more trying to help steer in a possible direction for why it may have been declined. :X