The hotel was out of power and the guests checked out, but because the telephone bill could not be calculated, the guests had to catch a plane. What should I do?

I remember that ordinary hotels will automatically change to mid-point rooms after working overtime, right? All this was told to the guests before opening the room. If he doesn't want to be disturbed. Pause again. He can't say anything if you change to a mid-point room. After all, the guests should have been informed of this situation before opening the room.