how to recover debts and retain customer ?

Before the delivery of  product to your customers ,You must have to take all pre-cautionely steps and finalize all about mode of payment with your customers.secondly for the recovery of debts,the company should have have to introduce the continuing product line strategy in the market.This type of strategy will be better for the recovery of companys debts.because of ,if any company cant follow the introduce the continuing new products line strategy with his sales and marketing Department,.then so called compamy cant recover their debtd and cant retain their customers.