Send a message to the teacher, don't go back and complain.

Education bureau. Send a message to the teacher If the teacher doesn't reply, you can wait for a while. The teacher had something to deal with and didn't reply in time. Send a message to the teacher, don't go back to the Education Bureau to complain, and safeguard your legitimate rights and interests. The Education Bureau is the administrative department of the education system, a national administrative unit, not a public institution.