Unable to download Argentinian apps on iPhone after region change

Since I moved to Argentina, I've been having trouble downloading apps. I updated my region, even created an Argentinian email address, and I still can't download any Argentinian apps. I also logged out, logged back in, and tried creating another account, but Apple wouldn't let me. Can you please help me? Thank you.

[Re-Titled by Moderator]

Original Title: Problems downloading applications