Can't give too many details as might be easily identified so will keep it short :
DS in an independent school, he had a disaster of a year where he has been physically attacked at school by a 'friend' and had very little support from the Head on this apart from "boys will be boys".
The incident upsetted him massively and more so the fact that that boy was never disciplined (school doesn't actually believe in discipline).
DS started getting really angry, his behaviour towards us deteriorated and after a few very argumentative weekends he told school "mummy tied my hands up and chained me in bed" 
Instead of school discussing /assessing this comment with us, or even understanding what triggered him to say this, Head called me to say she's reported me to an agency (apparently step before social services)
To cut a long story short agency called me, they were very empathetic , they realised where all this is coming from, gave some good advice and dropped the matter
I've had lots of clashes with the Head over the attack on my child and how she handled it and just wondered (as this is a first for us) should she have refered us straight away to that agency? It doesn't feel right as kids -especially when frustrated - are capable of saying the weirdest things. We ve been trying to deal with an awful situation and the impact on our child, and the Head's decision to do something like this made us doubt the school and his future in that environment
Any experience/advice on this is really appreciated x
P. S I absolutely get she'd have to do this from a safeguarding perspective but we've been in this school for years, never had anything like this before and it's obvious my kid is going through a really difficult phase