It looks like my new ISP may have actually saved their relationship with me. After 6 or so touches, mostly me calling them, where I got zero helpful information, I finally got a tech to call me back.
Not only did she call me with information that actually solved the problem, but she called back twice more to make sure I had the information and that it had worked.
Anyway, I’m still skeptical of BroadView Networks, but I’m definitely willing to give them a second chance.