If you don't understand the law, how can you determine the illegal charges of trust companies? You can ask the trust company to give you a reason for charging, and judge whether it is illegal according to this reason. Now if you think it is unreasonable, it is illegal. If there is no basis, it is useless to call the management department. Trust companies are supervised by the CBRC and its subordinate banking regulatory bureaus, and are specifically responsible for non-bank departments. You can complain to this department, and if you think it is illegal, you can also report it to the industrial and commercial bureau.
Laws and regulations can refer to the Trust Law and the Measures for the Administration of Trust Companies. And administrative measures for industry and commerce.