Balance: if you are quoting from "Sexual harassment and sexual violence in school", please make it clear that your figures to a You Gov poll of 16-18 year olds. https://publications.parliament.uk/pa/c ... 1/9104.htm
This is not to condone sexual assaults of any form but also not to exaggerate the size of the problem.
As has been said, schools will act if they have the information to be able to deal with the problem. I should add that I also had the misfortune of having to deal with a false accusation - but that was at secondary level, not primary.