This may be a stupid question that you have already checked out, but do any of the TVs hooked up to it work?
I've had Directv for abuot 3 years, and have about 2 cases of 2 minutes a piece where the weather had any effect at all.
I have however had cases where one of the TVs has issues. If its only one, check the splitter connection in your basement. Otherwise you can unplug the receiver from the wall, and wait a minute then plug back in. Turning the power off doesnt do it. Taking out the card and replacing it may help too.
If its all of the TVs then it is is probably the dish being obscured by snow.
But you can go into setup and have it search for the satellite signal. It has maybe 20 'channells' (cant remember the term in uses) and it will test the signal on each.
Hope that works for you. Otherwise, I would keep asking for supervisors until someone comes out tonight or tomorrow. If you bltch to a high enough level, you can usually get what you want.
By the way, I had mine mounted in the yard rather than on the roof, just in case I ever had an issue so I wouldnt need to climb up on the roof. They can pretty much put it anywhere as long as there is access to the southern sky. If you have a smaller yard and lots of tall trees, though it may not work. I believe they will come out and move it for free if you ask them.