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Runcheng Chuangzhan mdf internal doors-bedroom door lock-wood door manufacturers 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.best bedroom doors,4 panel solid wood interior doors,bathroom door options.