The heating guys are probably stretched thin right now. I feel your pain, we've had that happen, too. Bake stuff - then the warmth of the baked goods will help warm you inside and out, boil water, and be careful with the space heaters, make sure nothing flammable is anywhere near them. What kind of furnace is it? Natural gas, oil, coal?

In any case, the ones who said "We'll call back ..." call them back and follow up. Be obnoxiously persistent!