@Publisher There is proof that the letter was written. OP found a copy. As I read it, OP is carefully investigating to find out if said letter was actually presented to the school before deciding on next step.
I’m new to CC so maybe I’m missing something… but how is this back and forth on semantics and assumptions supposed to help the OP? She sincerely came to this group for advice and it seems this thread has veered off track. No offence intended.