Customer service courses can be provided by a number of sources. The best way to learn about customer service is from a course. Some examples are even available online. For example, organizations such as MindCypress provide a comprehensive collection of customer service training and other types of business training. Mindcypress.com offers a variety of courses and certifications, which are specifically designed to teach you how to provide excellent service to your customers.
https://www.mindcypress.com/product/customer-service-management