System State Code : 12.5.4

I have been a customer for the past 25 years and this is the worst service I have ever gotten. I had to call and try to understand someone that couldn't speak English if they even tried, then they sent me a new HR3000 Modem and I am still getting the System State Code : 12.5.4. . Tech support was supposed to call in 24 to 48 hours and that was 5 days ago and still no call. I have to hook up to my phone just to get connected to the internet. When I disconnect from my phone I get the 12.5.4 System code again. I am getting fed up with this crap and am seriously thinking about switching to Starlink.