"12309" is the most effective telephone number to complain against the police, and it is a tip-off telephone number applied by the Supreme People's Procuratorate and approved by the national procuratorate. If the police break the law in law enforcement, they can complain. You can also call the police inspector at telephone number 12389 to complain.
12309 procuratorial service center mainly includes three modules with specific functions of 13, namely: procuratorial service (including: appeal, criminal appeal, people's bank appeal, state compensation, other letters and visits, legal consultation) and case information disclosure (including: case procedure information inquiry, online appointment defense and agency, important case information, and legal document disclosure).
I hope the above content can help you. If in doubt, please consult a professional lawyer.
Legal basis:
Article 57 of the Civil Service Law of People's Republic of China (PRC)
Organs shall supervise the ideological and political work, performance of duties, work style, and law-abiding of civil servants, carry out diligent and honest education, and establish a daily management and supervision system. If problems are found in the supervision of civil servants, we should distinguish between different situations, remind them by talking, criticize and educate them, order them to check, admonish them, adjust their organizations and punish them.