What does the premium department of an insurance company do?

The premium department collects premiums, which are often divided into wholesale payment (one-time payment), three years, five years, life and so on. According to the payment time, the premium department reminds the insurance salesman to remind the customer to pay the fee the next year, and at the same time, the "orphan bill" (the original insurance salesman left his job and the policy was not renewed, the premium department urged him to pay it. It's a labor contract, but it's compiled from other places, and the income is still very good.