Maybe it is, but it attracts people who don't want to commit to a career for a great length of time - hence the high turnover. It's very repetitive work. You wouldn't want to go into a call centre and stay there all your working life. It's suited to students, mothers returning to work or those seeing out their time before they retire for good. Though short breaks are worked into the daily pattern, talking to your colleagues is frowned on.
Some people come in, do the job and go home, barely talking to anybody apart from the customers.
I'm sure it exists. The real problem is that companies only see call centres as a cost, not a source of revenue. In fact call centres are an increasingly important part of a company's brand. I deal with my bank exclusively by phone. My image of it comes from how long it takes to get through and how helpful the person is when I do.