Forgotten security questions - https://discussions.apple.com/message/18402551
More involved forgotten question issues - https://discussions.apple.com/thread/3961813
Frequently asked questions about Apple ID - http://support.apple.com/kb/HE37
If none of the above work, contact iTunes Support at http://www.apple.com/support/itunes/contact/ and follow the instructions to report the issue to the iTunes Store.
One exclamation mark is sufficient, or even none. In fact the topic was a question, begging the addition of a question mark. I did not feel incited to producing an answer any faster by a whole string of exclamation marks, and if anything was prodded to lassitude.