What should I do about copycats?

[LilPlant]

Hello, I have opened a small agency under the name of a personal sole proprietorship. We are a team of three, and everything was going well until we encountered impostors. They have been adding different numbers to the end of our agency's name or creating fake accounts to mimic us. I am under 18, so how can I deal with this without getting involved in legal battles? By the way, our agency has a trademark registration certificate, etc.