You could put up about 1000 posters all over the city with your cell number on it. Just dont put your name on them. When the cops call to find out who has been littering the city with posters, just dont tell them your name.
Just kidding
A guy in my area actually did this about 3 or 4 years ago with signs and it helped to fill his gym up pretty quick. Completely spammed 3 neighboring cities. When a sign was taken down he would just replace it with another one, and never tell city workers and police his name when they called to find out whos signs they were. His cell phone was constantly ringing. It was hilarious. The signs said bjj, muay thai, mma, and judo on them and a local traditional bjj guy called pissed about some other bjj guy popping up in the area. He said the bjj stood for British Jiu Jitsu. Really cool guy, but uhhh.....