bully boys

So on Saturday morning,  I am talking casually to middle child about what she will actually allow me to put into her school sandwich box, hoping she will slip up and express a preference for something other than dry bread.
One day this term I gave her boiled egg and she was teased by other boys but she put them straight with an indignant toss of her head ... or so I thought. But mentioning egg sandwich opened a whole other tub of worms.
Last January, I discovered my little girl was being picked on in the playground by a group of lads who had decided she had "the bogey touch" so no one else was allowed to touch her or go near her. I informed her teacher who dealt with it well, a couple of the boys cried. I had asked my little girl if everything was ok and she said yes it was. Life went on.
Only when all but one of the boys started to do it again nearly straight away she decided she was going to ignore it. They didn't stop. She didn't tell me, she didn't tell the teacher. The other children in her year who witnessed it didn't say anything either. Last week her elder sister complained because she kept trying to play with her on the Upper School side of the playground. Even then middle child didn't say why.
I strode in on Monday morning, the new head teacher was busy, I left a pre-penned letter and said I would be home all day. I waited. At lunchtime, I rang the school after Daddy badgered me. The receptionist was flustered, she had given the Head the letter but wasn't sure what had happened next. The Head would ring she said. At 3p.m. I rang again, got another receptionist who didn't know what I was on about, the Head was out at a meeting, but she left me on hold and came back saying the Head of Year wanted to speak to me at the gate. We did actually go into her classroom when I got there.
The upshot was that the the majority of the boys confessed. The two that denied were outed by witnesses. They had their play time taken off them for a day and were made to apologise. Their names have gone into the behaviour book. They have written letters of apology during lunch time, when my eldest happened to be passing through the room to hear one of the try to deny it again.
"Yes you did do it" she says ( I imagine with great contempt, hand on hip, surveying them with disdain) " You all bullied her" she said.
Apparently the TA over looking the process took my eldest to one side to try to persuade her it wasn't really bullying. My eldest didn't speak but she disagreed and thought the TA couldn't have known that it was going on from reception until now.
The school has not informed the parents again, as this is" another academic year "from the last incident.
I wasn't happy. I know three of the mum's, Have one of their mobile numbers in  my phone. Standing at the school gates and not saying anything is hard. If I was their parents I would want to know and not stand there unaware that another Mother is standing near by silently writhing with rage and ( yes I will say it) JUDGING.
 I know what they have done is petty, but not to my little girl. On the surface she may not appear bothered, but inside she feels sick and her anger boils over quickly at home. I know that they are only little boys, but its a good job none of them were in my kitchen last Saturday morning when she told me.