Exam disruption impacts my son, and school declines my request for Special consideration - anyone got experience of this??

I would be interested to know others views and experiences - inc teachers of course!! of the correctness of an invigilator speaking to a pupil in an exam, scribbling over their 'quote dumping' at the start of an English exam, when they handed their paper in at the end of the exam, telling them they are 'in breach of health & safety regulations' if they change their chair, telling them prior to the exam, in the corridor, that their computer reader was not working today, telling them off for ignoring their instruction [to change their chair] during the exam.

These all happened to my ASD OCD 16 year old son every day in the first week of his GCSE's. I have applied to the school for special consideration, as he was severely impacted by them, and overwhelmed with anxiety to such a degree that he could not think/write, let alone perform his best. He ended the week in tears, and only told me these things had happened at some point every day, on Friday that week.

The school is refusing the grant him Special consideration, saying that the disruptions were minor. I have quoted back to them JCQ regulations that state

that in such instances his disability should made minor disruptions major for him, but they are still saying no.

Has anyone won a similar battle please? If so, how?  Any advice and suggestions would be appreciated please! many thanks :-)