I don't care about getting comp'ed food (unless the order was obviously wrong and I was over charged), that's not going to make up for the 2 hours of wasted time. I'm not going to spend another 15 minutes waiting to talk to a manager while I "demand" that the bill be discounted or waived.

Fortunately, I live in an area where there is no end of new restaurants to explore, if I have bad service at one, then I just won't go back there. Problem solved (for me).

For the record, I've never tipped 0% (but have tipped only 10% for particularly bad service).