The term 'customer service" can illustrate the basic activity: customer service = service for the customer. The most important features in one of the definitions of customer service are to satisfy the customers, market orientation,  complexity, long term participation in the market and the double meaning (both activity and organization). To manage the relations and characteristic features of customer service into a system assist the effective operation and control of customer service : the customer service is a particular system (system part) to integrate and permanently coordinate the technological work to satisfy the customers. The dynamical interaction of the customer service and marketing is illustreted by the marketing - customer model (MV); which is suitable for the assessment of the effect of the customer service on the elements of the model.