Thats terrible and shouldn't have happened. This man is a danger to sex workers and should be treated as such. Did it happen up north or down south?
If it happened up North and you reported it to the PSNI and they didnt act you can report it to the Police Ombudsman.
https://www.policeombudsman.org/
If it happened down south and you reported it to the Garda and they did not act you can report it here
https://www.gardaombudsman.ie/
The police/garda should have taken a dna swab at the very least as well as a statement.
Hope you get sorted and im sorry this happened to you.