There is now a special hot line for handling tourists’ complaints to travel agencies. The phone number is 12301 (area code number should be added at the front for other provinces). visit beijing.
Those Beijing travelers can just dial 12301 extension 2 for complaints to travel agencies. Or you can go to the Complaints Center in Beijing Tourism Administration directly. When you make the complaints, you should remember to visit keep well of the travel contract and other favored evidences. If there is an emergency, please call 110 for police help.