Face unreasonable customer skills

This is your responsibility, and you have to pay for it. Someone repaired your car and gave it to you. You are responsible for everything. First, you should carefully observe the car and tell the customer what is the problem before entering the factory. If you don't find out, that's your problem! Of course, this is just what you said before. If it's really like what you said (the maintenance project doesn't need to open the door, so it can't be damaged in the factory), you can't tell the customer right away. You should explain your operation process calmly and then reason with him. Everyone in this society has a contract. There are slogans everywhere in the mall. I know what they are for. If someone slips and gets hurt in the mall, the mall has to do it without this slogan.