I switched my wifi over to a new home, I upgraded to make the install cheaper. But now I can't see my bill, this website just says it's unavailable. How do I pay this month?

This happened to me recently. Call their billing instead of waiting for a bogus late fee to appear that you then have to deal with. 

cox.help@cox.com is the way to go if you don’t get a resolution from the standard support methods (chat or phone).