I have bought a parcel from real estate, and when someone enters my land, they are being offered a landmark. Fine, but: The landmark they are being offered refers to another person and another store, which both are totally strangers to me. I asked the real estate agent, and he told me to contact the person, who's name and store is on the landmark, and ask him to fix it, so I have done that now. I guess it is the previous owner of my land. But is there anything I can do myself, if this person does not answer me?