Why do i have an "authentication code"

Hey there, Staplez. I'm very sorry to hear that you're having difficulty accessing your account. =/

If you are being asked for an authentication code when logging into the game client or Account Management, but did not personally associate an Authenticator with your account, then it's very likely that your account has been compromised. Unfortunately, this is a very common trend: in many cases of compromise, an unauthorized party will associate an Authenticator with the account in order to prevent the registered user from logging in.

Our Account Services department can help, though! We've many representatives that are more than happy to assist you in recovering your account. Now, I know you've mentioned that you've been on hold for while. Please stay on the line and a representative will be with you as soon as possible.

In the meantime, while you're on hold, I'd encourage you to review the following step-by-step guide in full, as it will walk you through every part of the recovery process: securing your account (very important!), recovering access, reporting any losses, and what to expect from the restoration process.

What to do if Your Account Has Been Compromised
http://us.blizzard.com/support/article/30796

If you have any questions, concerns, or even comments about any of this information, please let me know. I'm happy to help. :)