Grrr....ISP Trouble

For the past week our Class C has been routing off into the ether. Our ISP, ChoiceOne, has been unable to determine why our Class C suddenly disappeared off the face of the earth. I don't know why either, but I know it shouldn't take you a WEEK to figure it out. Our connectivity has been gone for a week, the trouble ticket escalated twice, and every time I called I was told "the" technician was busy, could he call me back? Sure, if he's really going to, because thus far "the" tech must be on permanent vacation because I've not heard boo from him.C'mon, ChoiceOne, figure it out. Either that or hire a second technician so "the" tech can answer my damn calls.