Is it a serious problem that your child is late and absent from class?

Why didn't the teacher just ask your son for the number? Still can't get it (your son won't give it)

Why does the teacher want your son's number?

From what you said, I can see that you are still protecting your children. Even if he did something wrong, you still blindly blame the teacher. Do you think this is a bit difficult?

Or you can ask other parents, did the teacher say this to you alone or to other parents? If you do the same to others, you can ask other parents to go to school and the Education Bureau to react. If you are only doing this for yourself, you should probably consider your own problems.