From Longman Business Dictionarycustomer serviceˌcustomer ˈservice (also customer services) [uncountable]COMMERCE1the department in a large organization that deals with questions and complaints from its customers, gives advice on using the product or service it provides etcJust ring 660000 and ask for the Customer Services department.For further information on product availability, contact Customer Service.2when an organization helps its customers by answering their questions and listening to their complaints, giving them advice on using a particular product or service, providing a good quality product etcThe company claims customer service is its number one priority. → service