Can't login in my account, security key code problems

Hey guys,

I've been playing Star Wars: The Old Republic for a while now, and I decided to set up a Security Key. I entered the serial number in my mobile device, and each time it sent me a a security key code, it took about 5 times or so to work as the security key codes would not be accepted. Finally after repeating the same thing, and refreshing the page, it worked. The thing is, I assumed the last security key code that was generated would be the one that I would use since it was the one that was accepted. I used that security key code when I login, but it won't accept it, so now I can't login at all. Please, please, please help.