Your case is extreme, but not unfamiliar.
Way back in my student days a friend of mine had a problem with his registration. I went with him to the admin building, he stated his problem.
Clerk goes away, comes back [this is before PCs and workstations, he had to walk] and tells mt friend - this is an exact quote, I can see and hear it like yesterday]: "I'm sorry, you don't exist."
The universities totally buu into the "never explain, never apologize" philosophy. However, if it looks as if you will sue them and get it in the papers - especially if you are African-American or part of another protected category [I know, it is no actual protection, but the U does not want to LOOK racist].
Being Aspie COULD help - I know a case where a student in Law School - with a lawyer father - filed a suit mentioning his learning disability. The administration caved.