How can I get them too escalate this?

My WinMTR test to multiple external hosts shows consistent packet loss and major latency spikes beginning on the first hop inside Frontier’s network (rd02.brnd.fl.ip.frontiernet.net) and continuing through multiple internal Frontier routers. The packet loss is persistent at 1% across hops, and latency spikes reach 200–545ms within Frontier’s backbone. This indicates congestion or an overloaded node on my PON segment or upstream routing. My in-home network is functioning normally; the issue begins once traffic reaches Frontier’s equipment.

I have been trying to get them to work on this for three months and I've had fields techs come out, upgraded to 5gb, added additional routers. It's pretty obvious they need to look deeper into it but the people I get on the phone are oblivious to how anything works.