Of course, the CSRC does not care about this matter, they are in charge of violations. The association doesn't care, because this is a small dispute between the company and its customers, and it hasn't risen to the point where it needs legal solution.

If you think the company overcharged you, you can negotiate with the settlement department with the bill and let them solve it for you one by one. If there is any difference, you will be repaid. If you misunderstand, they will explain. No futures company will tangle with customers on such a trivial matter.