China Internet Finance Association (NIFA) is the organization responsible for supervising the Internet finance industry in China. It aims to promote the healthy development of the industry, maintain market order and prevent and resolve financial risks. However, NIFA has no direct complaint telephone number.

If you encounter problems with Internet finance in Chinese mainland, you can try the following ways to make a complaint or ask for help:

1. Complain to the local financial supervision department: you can complain to the financial supervision bureau or other relevant departments where the company is located. The main responsibilities of these departments are to maintain market order and handle financial consumer complaints.

2. Complain to China People's Bank: China People's Bank is the central bank of China, responsible for formulating and implementing monetary policies and maintaining financial stability. You can complain to the People's Bank of China about violations of Internet financial institutions.

3. Seek legal aid: If your rights and interests are infringed, you can seek the help of a lawyer and solve the dispute through legal channels.

Please note that when handling complaints, you need to provide detailed evidence and supporting materials so that relevant departments can better understand and handle your complaints. At the same time, you can also follow the official website and social media platform of NIFA to learn the latest industry trends and policies and regulations.