Hey Sergio! I know what you are feeling... But it's not the moderatos fault! It's Live Nation! I had the same problem as you to buy my tickets for first Sao Paulo concert... I didn't recive my new presale code, because I'm here since 2009 and I used my presale code (I had two) to buy my tickets for Ireland. I renewed my subscription and I didn't recive my new presale code... And when they sent me one, it wasn't working!!! I spend all day, the GA was sold out and then, for my luck, they start to sell it again and I got my new presale code!
As I'm Boots group, if you read the FAQ, you see that