Keep the evidence and call the police.

first, the basic concept of the crime of fraud:

the crime of fraud refers to the act of defrauding a large amount of public and private property by fictional facts or concealing the truth for the purpose of illegal possession. It is one of the important crimes of property infringement stipulated in Chapter V of the Specific Provisions of the Criminal Law, and it belongs to the ordinary crime of fraud compared with the special crime of fraud.

the crime of fraud refers to the act of defrauding a large amount of public or private property by using fictional facts or concealing the truth for the purpose of illegal possession. It is generally believed that the basic structure of this crime is: the actor commits fraud for the purpose of illegal ownership → the victim has a wrong understanding → the victim disposes of the property based on the wrong understanding → the actor obtains the property → the victim suffers the loss of the property.

2. Criteria for filing a case:

1. General fraud: General fraud is the same as theft. For economic fraud such as fund-raising fraud, loan fraud and bill fraud, please refer to the Provisions of the Supreme People's Procuratorate and the Ministry of Public Security on the Prosecution Criteria for Economic Crime Cases.

2. Fraud of public or private property:

Article 266 of the Criminal Law stipulates that whoever swindles public or private property in a relatively large amount shall be sentenced to fixed-term imprisonment of not more than three years, criminal detention or public surveillance, and shall also or only be fined; If the amount is huge or there are other serious circumstances, he shall be sentenced to fixed-term imprisonment of not less than three years but not more than ten years and shall also be fined; If the amount is especially huge or there are other especially serious circumstances, he shall be sentenced to fixed-term imprisonment of not less than 11 years or life imprisonment, and shall also be fined or confiscated. Where there are other provisions in this Law, such provisions shall prevail.

According to the Interpretation of the Supreme People's Court on Several Issues Concerning the Specific Application of Law in the Trial of Fraud Cases, 1. Those who defraud public or private property with a value of 3,111 to 11,111 yuan, 31,111 to 111,111 yuan and 511,111 yuan shall be deemed as "a large amount", "a huge amount" and "a particularly huge amount" as stipulated in Article 266 of the Criminal Law respectively.