First of all, it is necessary to find out whether the quality problem mentioned by the customer is inferior or the use does not meet its use requirements.
Obviously, the products here are not inferior, nor are they products that do not meet safety standards. Do not belong to the production and sale of fake and inferior commodities, and produce and sell products that do not meet safety standards.
Second, this case is obviously that the customer bought the security door without knowing the scope of use. However, if the door can be used in some places, it does not have its due function. In the process of its use, the door did not have that function, which caused property losses to customers.
Third, if the use does not meet the requirements of its use, it is necessary to replace it with a new one;
Fourth, criminal issues: As for the losses caused by theft, after the police catch the thief, the thief will give the customer civil compensation according to legal procedures. It is unreasonable for him to ask you for compensation. That's a criminal problem, so you can ignore it. Let him sue you in court.
5. The litigation expenses shall be borne by the losing party (this case belongs to improper litigation). If the parties really go to court to sue you, they can only file a civil lawsuit. And if you are not at fault, he will lose the case, and then he will pay the legal fees. Besides, it has to compensate you for the loss caused by the lawsuit. QQ:75724734