in p5r, after getting certain achievements, you're supposed to get an email with a code for a bunch of free themes and avatars, there are 4 codes in total. i platinumed the game over a month ago, and never got anything. today i was fed up and decided to contact them directly using their live chat. the lady was helpful and quick, and i ended up getting all my codes no problem.
i know there were a lot of people online who never got anything despite reaching the required threshold, so hopefully this helps. just go to live chat. thanks for coming to my ted talk.
p.s. i am canada so it may not be as easy for you as it was for me, idk