There is no amount limit when filing a civil lawsuit. No matter how much the amount is, a case can be filed in accordance with the law, so a case of owing a credit card of 6,000 can be filed. According to Article 6 of the "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 Obstructing the Management of Credit Cards", the cardholder exceeds the prescribed limit or overdrafts within the prescribed period for the purpose of illegal possession, and has been called for collection twice by the card-issuing bank. If the money is still not returned more than three months later, it shall be deemed as a "malicious overdraft" as stipulated in Article 196 of the Criminal Law. Malicious overdraft, if the amount is more than 10,000 yuan but less than 100,000 yuan, shall be deemed as a "relatively large amount" as stipulated in Article 196 of the Criminal Law; if the amount is more than 100,000 yuan but less than 1 million yuan, it shall be deemed as a "large amount" under the Criminal Law. "Huge amount" as stipulated in Article 196; if the amount is more than 1 million yuan, it shall be deemed as "especially huge amount" as stipulated in Article 196 of the Criminal Law. The amount of malicious overdraft refers to the amount that the cardholder refuses to return or the amount that has not been returned under the conditions specified in the first paragraph. Excludes compound interest, late fees, handling fees, etc. charged by the issuing bank.