Here is a thought, in your business and work environment do you care about those you work with (customers, staff, etc) the same way you care about your family or close friends?
When you focus on your clients, listen when they speak, tell the truth, offer them quality all the time. Then you will have the foundation of a strong relationship with your client just like in your personal life.
Then in business over time you build trust and confidence in what you do and your clients will be happy to stick with you, just like your friends and family.
All the best,