I haven't called yet. I am still relying on my neighbors' connection so the failure is not affecting me much. Paul traipses in here every few minutes, it seems, to reboot - what he calls rebooting is simply turning it off and then on again, which is not what the cable people recommend but he won't listen to these things. In any case it is not likely to make a difference right now. I did a complete, careful reboot yesterday and it didn't matter.
Perhaps later today I will schedule an appointment. I assume I will be able to schedule it even though it's Labor Day.