What should I do if the person who borrowed money does not pay back the money or respond to messages?

Legal analysis: 1. Call the police. Those who do not pay back the money they owe can call the police or go directly to the People's Court to sue. When suing, you must bring relevant evidence, such as an IOU or something else. When there is not a lot of money, it is recommended that both parties negotiate privately first. As long as both parties can negotiate happily, there is no need to file a lawsuit in the People's Court.

2. If a friend does not pay back the money he or she owes and does not reply to messages, he should collect evidence and follow the following process to sue:

1. Prepare a civil lawsuit.

2. Bring a lawsuit to the people's court with jurisdiction and submit relevant evidence materials.

3. Attend and participate in litigation activities on time according to the notice of the People's Court.

4. If you are dissatisfied with the first-instance judgment or ruling, you should appeal to the original People's Court or the People's Court at the next higher level within 15 days after receiving the judgment or within 10 days after receiving the ruling, and submit an appeal petition.

3. When suing, the plaintiff shall advance the civil litigation fees first, and the court will ultimately decide who bears the costs. Litigation fees refer to the fees that parties should pay to initiate litigation procedures in the People's Court, including case acceptance fees and other litigation fees. The litigation fees that the parties shall pay to the People's Court include:

(1) Case acceptance fee;

(2) Application fee;

(3) Witnesses, Transportation expenses, accommodation expenses, living expenses and lost work allowance incurred by appraisers, translators, and adjusters when they appear in court on the date designated by the People's Court.

Legal basis: Article 577 of the "People's Republic of China and Civil Code" If a party fails to perform its contractual obligations or performs its contractual obligations inconsistently with the agreement, it shall be responsible for continuing the performance, taking remedial measures, or Liability for breach of contract such as compensation for losses. Article 675: The borrower shall repay the loan within the agreed time limit. If there is no agreement on the loan period or the agreement is unclear, and it cannot be determined according to the provisions of Article 510 of this Law, the borrower may return it at any time; the lender may urge the borrower to return it within a reasonable period of time.