Have you recently made any changes to your computer’s hosts? (C:\Windows\System32\drivers\etc)

I ask as changes to the hosts can result in this error.

Otherwise, I can only recommend that you continue to press the issue with your ISP.

Sorry, I’m not sure I understand. I take it you’ve made no changes to your computer’s hosts?

Unfortunately, this is a localised issue that we aren’t able to solve on our end.