Americans are unhappy consumers.

More people say they're experiencing higher levels of "customer rage" according to a new report from Arizona State University's School of Business.

The number of people saying they were very or extremely upset rose from 60 to 68 percent since the last survey done in 2011.

And more people are taking it out on customer-service representatives than two years ago.

Yelling went from 25 to 36 percent of the time; cursing went from 7 to 13 percent.

Studies show that when companies bungle customer service, it's worse than not having any customer service at all.

--Rob Archer