Aside from getting a different ISP, no, you're going to have to call AT&T. AT&T's IDS has picked up that traffic originating from your bridge is doing something nasty, and you have been flagged as violating the TOS. Therefore, your web traffic has been isolated.
This is an example of exactly why people new to pen testing are warned:
You should NEVER try to break things outside of your own LAN, or preferably, a lab environment.



