What country was your website set as viewing? I believe if not one of the participating countries, you shouldn't have been able to see the promo at all. If you had it set as the US website for example, and weren't in the Us, perhaps you've tricked Iberia.
As for the people who say Iberia doesn't know what country you purchased the ticket in, or that it doesn't matter, you are wrong.
iberia most certainly can tell which country's site you used, even if it doesn't show on your end. And it is very common for prices and conditions to be different based on what countrys site you are using.