This is one of the topmost posts in the forum in the gray area that you bypassed to post http://forums.autodesk.com/t5/autocad-lt-general-discussion/schedule-a-call-new-way-to-access-tech-s...

Most of us around here will not call you, we are customers just like you, not Autodesk employees: this is not Autodesk Support, but you can explore that in the other post you flew by http://forums.autodesk.com/t5/autocad-lt-general-discussion/enhanced-support-upgrade-for-lt-subscrib...

Did you restart your PC yet? What changed in the few days when it all worked?