Unauthorized blockade of trading accounts, extortion and intimidation without verification

I received a message from the customer service staff that I had operated in violation of the rules and regulations, and immediately charged 25% security risk margin from the investors. However, the customer service staff could not put forward my violations and supporting documents at all.
After repeated review, the customer service replied that my trading account was legally profitable and there was no illegal act.
Can your arbitrarily block the investor's account and extort any margin and risk fund from the investor?
According to the principle of one person for one account, please tell me about the difference of individual bank account and the individual company account. What is unknown funds?
Excuse me, why do you charge self certification fees from investors instead of receiving personal documents and bank data?
Can it be proved by stored value and cash? Is there any document for reference to corroborate my personal data?