My son broke his ankle at school and told the teacher and was told to walk it off. No medical help.

You should immediately consult a local personal injury attorney to determine where liability falls.  Most personal injury attorneys offer free initial consultations, so it would be in your best interest to discuss your case with a local attorney. This is not intended to be legal advice, and is general in its nature. No attorney-client relationship exists or is formed by this information. Furthermore, this does not represent the views or opinions of LexisNexis or its affiliated companies.