If you have to go through the judicial process, I will tell you what to do:
1) Find the relevant departments of the police station, public security sub-bureau and public security bureau.
2) If the public security system just doesn't care, you need a "notice of not filing a case" from the public security department, and then you go to the procuratorate to "urge to file a case".
3) If there is a "notice of not filing a case", you can also go directly to the court, bypassing 2).
4) If the other party is unwilling to open this notice, you can go to the local notary office and ask them to follow you on another case. If you can't file a case and don't give you a notice of rejection, then let the notary give you a record and repeat steps 2) and 3) with the notarial certificate.