My friend owed me money and didn't pay me back. I sent a message to his father, and he asked me how to punish him.

Stay calm and respectful, state your feelings, point out the responsibilities of the other party, and keep communication records.

1, calm and respectful: keep a calm and respectful attitude when communicating with friends. Avoid using offensive language or emotional expressions to avoid aggravating tension.

2. State your feelings: explain your situation and feelings to your friends. Clearly state the amount owed by the other party, the loan time and other agreements. On the basis of objective facts, let the other party understand that this is a problem that needs to be solved.

3. Point out his responsibilities: point out the responsibilities and obligations of the other party and the commitment to borrow money. Let the other party know that this is not only a matter of money, but also a matter of trust and respect for friendship.

4. Keep records: In the process of communication, keep all relevant words or communication records, which can be used as evidence or memos to facilitate the tracking and settlement of disputes in the future.