1. If the person involved is defrauded after paying back his credit card, he can certainly call the police. If the amount reaches the standard for filing a fraud crime at that time, the police will file a case for investigation and impose additional criminal liability on the suspect. If the criteria for filing a case are not met, the police will impose security penalties on the offender and ask him to return the property of the person involved. 2. Legal Basis: Article 49 of the "Public Security Administration Punishment Law" Article 49 Whoever steals, defrauds, robs, snatches, extorts, or intentionally damages public or private property shall be detained for not less than five days but not more than ten days, and may be fined not more than five hundred yuan; If the circumstances are serious, the offender shall be detained for not less than 10 days but not more than 15 days, and may also be fined not more than 1,000 yuan. "Interpretations of the Supreme People's Court and the Supreme People's Procuratorate on Several Issues Concerning the Specific Application of Laws in Handling Criminal Cases of Fraud" Article 1 Fraud of public or private property worth 3,000 yuan to more than 10,000 yuan, 30,000 yuan to more than 100,000 yuan, 500,000 yuan The above shall be deemed as "relatively large amount", "huge amount" and "especially huge amount" as stipulated in Article 266 of the Criminal Law.