Accessories Unresponsive, Engineer Won't Read Case Notes

Like many people, I experienced a bug in November 2023 after an iOS upgrade in which the 'What's New in Home' splash screen appeared each time I opened my Home app.

A few weeks later, that screen magically disappeared, but at the very same time, some of my smart home accessories became unresponsive, and have been unable to reconnect.

The issue has been escalated to the engineers, who have 'filed this as a bug', but make it very clear in their limited responses that they haven't even read the case notes and therefore are likely waiting for the case to time out after 30 days. Meanwhile I have hundreds of dollars in smart equipment that are dead in the water.

I've talked to dozens of Senior Advisors, and because they're technically outranked by the Engineers, none have been willing to go to bat for me and let anyone know that my issues are being ignored.

Does anyone have experience with a situation like this, who might be able to offer some insight on what I might be able to do to get any sort of resolution here?

Thanks, all.