1. Establish contact with HNA Futures, explain the situation and seek solutions. You can communicate by telephone, email, offline visit, etc., and keep communication records, such as conversation record or email backup.
2. You can report your experience to the relevant regulatory authorities. In China, the regulator of the futures market is China Futures Regulatory Commission (CFTC). You can complain to CFTC and provide information and evidence.
3. If the loss is large, you can seek legal aid, consult a lawyer and discuss legal action.