Twilight Zone HA HA kind of funny, being a Comcast customer is like that.
I often have internet outages with my cable box and TV being normal.
I have read on another post if you go ahead and subscribe to HBO online you will be able to watch it.
Personally I would watch my bill but how could they double bill you for HBO.
It you use the phone support to contact Comcast about a problem with TV service a recorded message will tell you if there is a service outage in your area with an estimated repair time. This works with internet outages also. It usually takes less than a minute.