Amen brother. If somebody dislikes you so much, step one should be that they just leave you alone and ignore you if you're around, not seek out each and every single one of your alts and hassle them just because they have the same login name. It's a HUGE bloody world here, with 3 servers and literally thousands of areas and a player base approching the population of a small city. If somebody can't just leave you alone with that much space, then they have serious issues. If they keep bothering you after asking them via tells to leave you alone, take plenty of screenshots and report them to Leanthar.