This answer to this question -- "Where can I write a letter to AT&T?" -- is far too difficult to find.  This should be in the "Contact Us" information on the main support page.  Not everyone wants to talk on the phone, chat with someone, or send an email.  Some people still prefer the good, old fashioned way: writing a tangible letter and dropping it in the mail.  There should be a correspondence address listed on your main page instead of just a billing address. 

[Subject edited to reflect new topic]