In a democracy, people are presumed innocent before proven guilty. If one is presumed guilty before he can prove himself innocent, that is not a democracy.
My nephew is studying in Newcastle, UK. He recently have a problem, his classmate (maybe roommate) copied his assignment. The school found out and accused him of 'allowing other to copy his assignment' and failed him. He appeal to the school. They asked him to prove that he didn't allow his classmate to copy his assignment but at the same time they couldn't prove my nephew allowed his classmate to do so. The boy is really upset. Anyone here lives in UK has any suggestion?
He has an academic advisor (usually one of his lecturers) who should be taking his side on this. If not each university have it's own student services and student union. Exhaust all the options within the organisation first.
Always use the words "amicably" or "without prejudice" to end your correspondence even though you have no intention of doing so.
Even if your nephew manages to be cleared of allowing others to copy, Newcastle university will never admit they have made a mistake. This is for their legal cover.
If it cannot be resolved internally, this is your next option.
This would take some time so he can look around other universities to transfer to, especially if he is paying full fees, this is the best way of saying fk off without saying anything.