We only receive reports from sex workers and disseminate them to other sex workers. We don't go to police, because most sex workers don't. In the current context, even if that massage parlour had contacted the cops, the likelihood of it being taken seriously and any meaningful action being taken is pretty slim. Because the law is so hostile to sex workers and the attitude of police is so hostile to sex workers, we're usually received with nothing but contempt and dismissive attitudes from police.
Obviously, what we aim for in a decriminalized context would be to be able to report those things. We work very, very hard in organizations like mine to try to accompany women who want to press charges, who want to denounce violence to police. It is pretty rare that any serious action is taken by police.