This is a good question for many businesses today. There are several essential actions not the least of which is treating customers with respect as individuals not a dollar sign. Other actions include treating you employees with respect and reward them when they go above and beyond for the business.
Other factors include good products and services which includes quality characteristics. Customer service operations within a company can turn away current customers and lose potential customers if a company does not make the customer's happiness first. When customers have problems they want them fixed the first time not the second, third or fourth.