Customers call to inquire about the products, customer service answer and note down the customer's work address, unit, contact number, follow-up customer problems later.Provide special door-to-door service, on-site estimated payment, the whole process is transparent and controllable. Welcome customers to supervise, complain and suggest our service. If customers have any comments, questions or suggestions on our website, please call us. We will thank you very much for your call. We will continue to improve our service according to your valuable opinions.