Legal analysis: it's very troublesome not to pay the debt. You can't win the case. 1. Write down what he said about borrowing money, and it's better to have more than two people present as witnesses. You can't expose the intention of going to court, that is to say, be reasonable. 2. Go to court for prosecution and give evidence to the court through recording and witnesses. Explain that you have evidence of borrowing money, and the court can accept it. 3. The court heard that you borrowed money and you still have evidence (the recording is also evidence, and the witness is also evidence). He said he had paid it back, so he had to prove when he had paid it back. If he couldn't say it, the court thought he hadn't returned it, and the court ruled that he had returned it.

Legal basis: Civil Code of People's Republic of China (PRC).

Article 667 A contract is a contract in which the borrower borrows money from the lender, repays the loan at maturity and pays interest.

Article 668 A contract shall be in written form, except as otherwise agreed between natural persons.

The contents of a loan contract generally include terms such as loan type, currency, purpose, amount, interest rate, term and repayment method.

Article 669 The borrower of a loan contract shall, at the request of the lender, provide the true information about the business activities and financial status related to the loan.