If it is a patent, you can go to the Policy and Regulations Division of the Shanghai Intellectual Property Office for administrative complaints and mediation. No. 915, Julu Road, Jing'an District, Shanghai. Website: www.sipa.gov.cn
Each district or county also has an intellectual property office, which works together with the district science and technology committee. If it is a district, you can also go to the district or county intellectual property office (science and technology committee). Committee) consult first.
You can also go to court to go through legal procedures.