Provide automated attendant telephone answering during non-business hours. Publish home telephone and beeper telephone numbers on business cards. Knowing that it's possible to get in touch at night and on weekends provides a high level of comfort to the customer. If an emergency should arise, the customer knows that connection is possible. Offer helpful suggestions.
Every business has FAQs, or frequently asked questions.
CSRs know all of them. Not only does it reduce the number of telephone calls, it makes customers feel better informed. Staying in touch with customers lets them know you are thinking about them, not taking them for granted. Send helpful information, not just advertising material. Customers like to know what you are thinking, not just what you are selling.