Current fix: Make another account
Yes, I got this after almost 3-hours chatting with EA Support. I asked to delete my original account [DarkGhostHunter] to make it again, but they told me that it wasn't possible. The only way I had to play the multiplayer is with another account. So, I created another one.
Other problem surfaced: "I will lost my Limited Edition content!".
Current fix: Ask support to give you a promo-code.
With the new account running the multiplayer, support gave me a promo code to redeem in this page: http://www.gamesas.com/redeemcode/
But it didn't worked, nad that's another issue: http://support.ea.com/app/answers/detail/a_id/4983/
Support scalated up my issue, and said the studio was working in a fix for the Corrupted Accounts and Promo-Codes not working. For the time being, this is all you can do. If you're looking to buy Crysis 2 for PC, i won't recomend to do it until the game has fully fixed these things.