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Jolly back case-iphone 6s case After discussing the plan of investment, we decided to invest heavily in the service training. We built an after-sales service department. This department tracks and documents any issues and work to address them for customers. We regularly arrange and conduct customer service seminars, and organize training sessions that target specific issues, such as how to interact with customers through the phone or via the E-mail.iphone charging case,samsung galaxy a21 case,samsung s20 plus case.