Hello:
The school has discretion on what to do. However, you may want to provide daily correspondence regarding incidents which occur so they are "on notice" and will keep taking action. A pile of letters outlining bullying cannot easily be ignored and this would also show what they are doing is not effective. Having an education lawyer contact them also could not hurt.
Best of luck,
Michelle Ball
Law Office of Michelle Ball
California Education Attorney advocating for the rights of parents and students since 1995.
Website: http://www.edlaw4students.com
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PLEASE BE ADVISED THAT THIS DOES NOT CONSTITUTE LEGAL ADVICE NOR FORM AN ATTORNEY CLIENT RELATIONSHIP.