What is the main point of Chen Sanliang's complaint? Can you introduce me?

Li Jiujing, a scholar in the Ming Dynasty, was framed and killed by a traitor. In order to bury her parents, raise her younger brother and betray herself, her daughter Li went into a brothel by mistake and changed her name to Chen. She is talented and can write plum blossom seal script with both hands. Because she decided not to be a prostitute, she earned money by selling articles, and each poem she wrote sold for three taels of silver, so she was called Chen Sanliang. Sanliang adopted the orphan Chen Kui as his younger brother, taught him to study and helped him take the exam. Later, Sanliang was sold by his wife to jeweler Zhang Zichun as a concubine, but Sanliang refused. Zhang bribed the magistrate of Cangzhou, tortured him, and forced him to be "good friends". This state official turned out to be Sanliang's long-lost brother ... Chen Kui, Chen Sanliang's righteous brother, was the governor, and Chen Sanliang stopped the sedan chair to complain, and his grievances were redressed. Li Fengming was dismissed from office.