This is so familiar. We had the school get an Educational Psychologist to evaluate our (then) 8 year old. We were asked to provide a file of 'evidence' to present to him. This irked us no end, as teachers all along had said our son was exceptional. So, we scoured the school reports and collated the 'teacher' evidence and presented same to the Headmster and the EP (who, incidentally, in our first meeting hadn't been told any background, or received our 'evidence' )

Eventually, after assessing our son we had a case meeting:
"Is this boy talented? - Yes. Is this boy gifted? Yes"

The headmaster managed to avoid the meeting. we are due, by law, a written assessment which we still, 6 months later have not had. And the school put our son on the Special Needs Register for HIS educational problems!

So I guess I am saying to you, you are not alone, a lot of us have similar experiences and feel and share your frustration and anger.

Our solution was to put him in a private school (God knows how we will find the money) but at least his individuality is nor penalised, and his exceptiona abilities and gifts are appreciated (so far)