The best of form of marketing is through your customers! If they're happy, you'll find your products selling, but if customers aren't happy, you'll find yourself in a bit of a tough spot. Success of a brand not only depends on how awesome the product is, but also on customer satisfaction. Keeping customers happy is more than a prerequisite in today's world for the success of a brand. Right from respecting your customers to investing in improving customer loyalty, each impacts the performance of the company; this is reflected directly on the sales! Follow the below link to find out ways to keep your customer happy: 

http://www.listenupespanol.com/News-Resources/bid/92851/4-ways-to-keep-your-customers-smiling