I have to presume that the trafficking victims did not feel like calling the police was a viable option. Does anyone know why? What happens if someone calls 911

I have to presume that the trafficking victims did not feel like calling the police was a viable option. Does anyone know why? What happens if someone calls 911 and says “I’m at a hotel and this guy is beating me?” I know so little about this world, my imagination can’t even fill in the blanks.