The best way is to find out the specific situation of the other party, ask for business license, training notice and other similar documents in the name of reporting to the company leader, and write down the full name. After receiving the information, call 1 10 to report it and expose it on social media (generally, there are more or less fire department personnel behind such institutions. After the alarm is exposed, you should also pay attention to whether there are fire department personnel to check your place. Generally speaking, the person who came to investigate may be behind the scenes and should not be soft on him, so you should take countermeasures in advance.