Hm... No Alexandre87 on this site... And the only other similar accounts were completely dissimilar to you.  You really have failed to provide any evidence that it wasn't you (just claims that require evidence), and your return right after the IP was blocked really is a bit damning.  Plus, I've offered a way to prove it wasn't you: just go to WP:SPI, file a report on yourself, and ask for a checkuser.