Check out this forum. They appear to handle UVerse issues as well. Someone please jump in here if I'm wrong. TIA.
 Check this link for "rules." Scroll down to "For AT&T UVERSE CUSTOMERS ONLY!" They mention an email address there and what to do if you don't get a solution to the problem.
»Posting Rules - AT&T Direct
I had an 8 hour install. Not pleasant, but they did figure out the problem. Was an issue with their three-prong plug on the UPS power supply. Mundane and took forever. They re-ran the Cat5e twice thinking they had a nick in the line.
Hope you get some relief.