If the party has evidence of the other party's arrears, it can collect evidence of the other party's arrears, such as IOUs, and write a complaint to bring a lawsuit to the relevant court.
If there is no evidence of the other party's debt, you can call or make an appointment to ask the other party. When the debt will be paid back, the other party will generally answer. At this time, the party can use mobile phone recordings as evidence.
[Legal Basis]
Article 63 Evidence includes:
（1） Statement of the parties;
（2） Documentary evidence;
（3） Physical evidence;
（4） Audio-visual materials;
（5） Electronic data;
（6） Witness testimony;
（7） Appraisal opinions;
（8） Record of inspection.
Evidence must be verified before it can be used as the basis for ascertaining facts.
Article 64 The parties have the responsibility to provide evidence for their claims.
The people's court shall investigate and collect evidence that the parties and their agents ad litem cannot collect on their own due to objective reasons, or that the people's court deems necessary for the trial of the case.
The people's court shall examine and verify evidence comprehensively and objectively in accordance with legal procedures.
Legal basis
Article 63 Types of Evidence in the Civil Procedure Law of the People's Republic of China (2017 Revision)
Evidence includes:
（1） Statement of the parties;
（2） Documentary evidence;
（3） Physical evidence;
（4） Audio-visual materials;
（5） Electronic data;
（6） Witness testimony;
（7） Appraisal opinions;
（8） Record of inspection. Evidence must be verified before it can be used as the basis for ascertaining facts.
Article 64 of the Civil Procedure Law "The parties have the responsibility to provide evidence for their own claims. The people's court shall investigate and collect evidence that the parties and their agents ad litem cannot collect on their own due to objective reasons, or that the people's court considers necessary for the trial of the case." It can be seen that this provision also first affirms that the parties have the responsibility to provide evidence for their own claims, To prove the existence of the claim.
