I've been on the phone with an ISP tech person who assumed I was an idiot or lying to them.
After informing them that, 'yes, in fact a telecommunications electrician has checked the phone line, but I don't see how that could be the problem,' and then having them tell me, "Mr. [X], you mustn't have done something, we will have to go through the procedure again." This would have been the 3rd time, I'd been on the phone for over an hour.
My response. "No, we've done it twice over the phone, I already did the same thing 3 times myself. And actually it's Dr. [X]." That stopped him dead. He stopped hassling me and passed on the problem to someone higher up.
We got a call back the next day. Turns out there was a bug in the ISP's code.
Moral to the story: best use for a doctorate, correcting tech support people who thing you're stupid.