@ehashman It's an interesting and frustrating situation. When I was younger and living in pretty significant poverty, there probably would have been a legal-aid society or something that could have helped me with this. Or if I were significantly richer than I am, I'd likely have an established regular relationship with a law firm and could just have them deal with this as part of their ongoing work for me. But in between those two economic extremes, there's basically not a lot of help available, because not a lot of firms want to take a case this small as a one-off even with a client who could easily pay them to do it.
Though I am admittedly guessing at the amount in dispute, because I literally don't know what it is. Their systems (correctly) identified that I'm not the account owner, so wouldn't let me actually see the tickets they were filing for past-due amounts, even though they were also emailing me about those tickets.
For now, I'm continuing to work leads, and have also filed a complaint with the state attorney general's office, to see if that'll get anywhere.