No, the employer just needs to adjust wage so it's a bit higher than market price (in which case you'd get a less risk of suddenly quitting versus the average in the market). Or the employer can use golden handcuffs.
I think you simultaneously overestimate the value the employer puts on call center employees and and the level of interest your typical call center employee has in keeping that job. A small amount of increase isn't going to help reduce turnover.
