This turns out to be a lurid tale of AT&T incompetence that has apparently snared others as well. Because it isn't exclusive to Macs, I'm posting a Networking thread about it—with a link to it here in ...
My 26-year-old att.net account is broken, and AT&T can't fix it. AT&T's system says my 26-year-old DavidH***@att.net already exists, but I can't access it. I wanted to replace it with a Verizon FiOS e ...