"Please Enter Valid Security Code" Help

I am on the stage to use my Apple ID with my Itunes account, so its asking me confirm my information via security code. So I do so, enter the 3 digits on the back of my card, it tells me to enter a valid one. I would my IQ is high enough for me to manage entering 3 digits. After some google'ing I found this: http://support.apple.com/kb/TS1646. Which actually made sense, because the information was different then the information already provided from my Apple ID. So I type in my adress EXACTLY (caps included, title and full name as it appears on the credit card). Still getting the same "please enter a valid security code." I phoned apple help, but they told me Itunes doesn't have phone support and offered no help of his own except "wait."