Someone sent harassing text messages to sow discord. How do I know who this person is?

I already know it's a provocation, so I can ignore it and let that person ask for it. If that person's purpose is not achieved, it is the best response and protest. If you can't find the technical means and the landlord wants to know, you need to understand it with your heart. People are intuitive and sometimes accurate. I hope I can help you.