They were confusing their LAN addresses with TWC or other addresses.
It's proper for your LAN address of 192.168.x.x or 10.x.x.x to not change when you change services.
That's your LAN address and not owned by TWC, Comcast and such.
I previously had TWC for Home Internet, I now have Fios. I'm using the factory Verizon router. My wireless speeds are as advertised, roughly 25/25, but my hard-wired desktop is getting 1.5/1.5.
The IP address on my PC shows the old TWC IP, not the Verizon IP. Logged in to the router settings and didn't see any issues in there.
After doing some research online, I have reset and rebooted the router to no avail. I have run the command prompt of "ipconfig/release" and then "ipconfig/renew", but neither of those work consistently. I have gotten it to work, but the next time I get on, it is back to TWC.
Is there some type of cache of IP addresses that I can purge? Please help