China's "Labor Law" clearly stipulates the post adjustment of employees: if a company needs to change its employees' original posts or adjust their posts, it shall negotiate with the employees and sign a written document after both parties reach an agreement. Unilateral compulsory transfer without consultation may be considered as a violation of employee contracts and labor laws and regulations.
So if you can't negotiate with the company, you can try to apply to the local labor arbitration agency after writing the complaint materials. In this process, it is suggested that you collect evidence, such as post transfer notice, post responsibility change and other documents, consult professionals to obtain more accurate legal advice.