Don't listen

When i went to the school to pick up my son.Normally i let my son play with other children in public garden.Made me laughed this afternoon because there is one little girl who came to me and said that she is one of the classmate of my son.She said that**You know virgile sometimes didn't listen to our teacher,he already punished twice**I reply,really?i will scold him.And when i just look at her eyes,she is just like so happy to tell me what my son did during school!When i asked my son,of course he denied it!grr.He start to lie now!