Not to mention that the state does not authorize the police to perform police duties alone, and beating people alone is a serious illegal act.
The state has not authorized any unit or individual to hit people.
Now, you can complain to the discipline inspection and supervision department of the public security organ at a higher level or the procuratorate.
You can also complain to the Political and Legal Committee and the National People's Congress.
You have the right to claim compensation for the harm caused to you.