Just scrolling and saw yyy’s older post. I’ve had to make complaints several times when I lived in a noisy neighborhood. The police do respond if you write in English, albeit more slowly, but there are ways around it. First, you don’t have to give a real name if you make the complaint online. I’m sure not every city has an online complaint system, but you can use a Chinese name and use a burner email each time. If you can’t write in Chinese and don’t have a friend to do it, explain the problem in simple statements and use Google Translate. It’s not great, but Taiwanese don’t write Chinese perfectly when they’re online anyway. For a situation like this, you can upload pictures that would explain most of the problem anyway. I always included pictures of stores and their noise equipment.
Practically every time I made a complaint, I got a response. Sometimes it was just saying that the noise was not excessive, which probably means they went at the wrong time, other times they spoke to the manager and the noise level went down for a week.
Alternatively, hire a person to make a complain, or go talk to the troublemaker directly if you don’t want to get friends involved. No need for gangsters.