For my American readers: Apparently you won’t find this number on their Web site, but Kevin Kelly has located this semi-secret number for a real human at Amazon customer support: 800-201-7575.
UPDATE: Champ asked if there was a contect number for Amazon Canada. A quick search brought me to this page, which indicates that the 7575 number is good for US and Canada. I stand corrected. That page led me to this page, which seems to be the bitter center of the Amazon customer service number universe.