If it is two investors, it generally does not constitute a crime. But you are engaged in brokerage business and generally need permission. Those who engage in brokerage business beyond the scope may be suspected of illegal business operation; If it is generally out of range, you don't have to pay attention to them.

Personally, I don't think it constitutes a criminal offence, so I suggest to negotiate with the customer to solve it.

Your company should act as an agent and be irresponsible for the loss. You can claim that the agreement is invalid. You can consult specifically.