Sorry for posting this as a short diary but I want as many people to see this as possible. If you're still having trouble signing up for ACA and are unable to resolve the issue through their customer support, please contact your state representative. (Your local state rep, not your US Congressperson.)
Your state representative's office can assign you a case worker who will help you complete the sign up process. I was able to receive assistance this way. It was relatively painless, and my case worker was very kind and attentive. You can look up your state representative's contact information here: http://openstates.org/...