This question is actually not complicated at all. You can report directly to the Education Bureau. Generally, the local education bureau will announce the report phone number and answer it.

Just call this number.

However, the price of the canteen exceeds the standard according to the actual situation. The policy will generally announce some unexpected situations, such as having a small stove and choosing a set meal. They are all good at grasping the border, so if you report it, you must use real evidence, otherwise it will be very unfavorable to yourself. But also has a certain impact on the school. Think clearly about everything so that you won't suffer.