What would you do?

My 4 year son started school in September and I kid you not, at least twice a week he comes home with accident slips. On the slip, it says that that he fell while playing in the playground, however my son tells me that another child pushed him. He mentions the same name every time. I know my son is very active and loves playing but if he is repeatedly saying that someone is pushing him but the teacher writes that he fell himself while playing, would you address this with the teacher if it was you?