If you have a complaint about Shanghai Junchuang International Finance Leasing Co., Ltd., you can contact their customer service department first and explain your problems and dissatisfaction to them in detail. You can contact them by phone, email or writing. If the customer service can't solve it, you can complain to the regulatory agency or industry association of the financial leasing company. For example, you can complain to the local financial supervision bureau or the financial leasing association and provide relevant evidence and details.