2. It is indeed feasible and inevitable to make a complaint call to the CIRC, but the process will be slow. Now that you have left, I won't say much about this step.
3. Report the case to the Economic Investigation Brigade of Weifang Public Security Bureau and apply for public security investigation. They will file a case within 24 hours, but I don't know how long it will take.
That's all. Just try it. I am close to you, but I am not optimistic about your situation. Insurance companies have never been defeated in bullying small retail investors. Good luck.
Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.