Be glad they even called you back. I had a simple question about VDSL2 availability and didn't feel like waiting the 57+ minutes for a callback so I tried the "Ask a question" form in members tools; 12 days later and no one ever responded.
I'm a relatively new subscriber--a bit over 4 years, experienced legacy ADSL1 across 2 cities; my folks in SF on CO Fusion; and my current household with FTTN Fusion. It's unfortunate stories like these are cropping up. While I haven't had to call Sonic telephone support for over 2-3 months, I've never waited more than 5 minutes even on weekends when they were open. Email have been replied within 24 hours on weekdays and usually Monday/Tuesday if I sent it during the weekend. Estimated wait times of over 30 minutes definitely don't sound right.
My initial concern was a lot of people wanted more speed and those members wanted Sonic to rapidly expand coverage. Sonic reselling AT&T FTTN was a way to mitigate some of the void so it made business sense. But it's always balancing act whenever coverage is increased and staff support personnel are hired/trained for it.
I'm inclined to believe the majority of customers don't have an issue but "the squeaky wheel gets the grease."
Hopefully Dane or someone on the executive team could post a formal reply.