A stranger blacklisted his name and kept calling and texting and harassing him. . It's been going on for a month. What should we do with him?

You can ask him why he bothers you. If there is a reason, for example, you don't know that he quarreled with you, you can try to calm TA's anger and see if it is your fault. If it is your fault, you should apologize seriously. I believe TA will forgive you. Even if it's not your fault, there will be more or less your reasons for quarreling. You can also gently point out his mistakes, and then sincerely apologize, and you can make up! O(∩_∩)O~

If someone bothers you maliciously, hum ~ ~ ~ ~ fight back! It's cruel, and you sent harassing text messages to kill him! Come on ↖ (ω) ↗

I hope the answer can help you ~ ~