The company's marketing department is responsible for the after-sales service of the products. It has established a complete "Customer File", regularly understands the customer's ordering tendency, and makes timely preparations for goods. It communicates with customers, properly handles customer complaints, and regularly measures customer satisfaction. The marketing department promptly transmits the quality information fed back by customers to the internal quality management department, sends people to the accident site to handle it as soon as possible, and organizes relevant personnel to analyze the causes and formulate rectification measures until the problem is closed and customer satisfaction is achieved.