Does writing debt collection slogans infringe the right of reputation?

Writing slogans does not infringe on his reputation, because what you say is the truth. But the corridor is not your private territory. You cannot write slogans on the corridor, otherwise the owner can ask you to clean it up. If you have space to write slogans on the owner's front door, the owner can also call the police. The legal way is to wear a coat with a slogan printed on it, or go to the downstairs of his house or the door of his unit with a sign with a slogan to collect debts. It is not advisable to interfere with other people's normal work and rest, or infringe on other people's property rights, as it will cause public outrage.