As I recall there are several posts regarding this, just a matter of finding those right keywords.
As I recall its because the DirectAdmin staff is small (2 ?) and the ammount of bogus calls (issues not related to DirectAdmin) either the phone line will be busy or they no longer have it. Not sure about the woman though, never tried calling. There was another thread about a new website, perhaps they haven't removed it because their working on their new one. And because of the lack of time they are not on live support anymore, or rarely at best (I've never seen them)
As such email is the best solution as it lets them sort through and answers the higher prioity as well as order in which they recieved them much more efficiently. Then they can work on new features
As far as I know, they are working on a Reseller system to help reduce the support load etc by raising prices to buy licenses directly from DA and so let the reseller handle the licenses and support.
In conclusion for support email them using the email addresses listed on that support page. In my experience emails have always been answered the same day or if the problems/questions you have don't necassarily need DA support, post it here on the forums and maybe other members may be able to help you.