"Please hold, your call is very important to us and we'll be with you as soon as possible" is a line everyone's heard before, whether you're calling to switch your cell phone plan or you need to look into mortgages at your bank. But which industry is rated worst in customer satisfaction? A new survey by the American Customer Satisfaction Survey has found that Internet Service Providers (ISPs) have the lowest customer satisfaction rating, even worse than tv subscription services, airlines and health insurance.