Hey Scotland…..I do not keep my old plane tickets….especially not from 3 years ago, so, no, I do not have any proof that I left the country before my visa expired.
Or, at least any proof that you would find acceptable.
Why Scotland, why do you think I am a criminal who is living on your fair land illegally?
The Scamp Abroad 
This is ridiculous. The same problem happened to me just a week ago when I was denied entry into London. Even though I had a bunch of EU entry stamps they said that somehow this didn’t constitute proof that I’d left. WTF??
I read your ordeal. That was straight up crazy! This isn’t even immigration and customs hassling me, this is the school! I haven’t even been able to apply for the visa yet!
ugh bureaucracy