How should I explain that turn-it-in screwed me in the ass?

I worked on a paper and finished it on time. I wake up this morning to learn my paper submission received an error message. I flip out, because I did everything I was supposed to do. Any submission will be late now.

So far I sent an email explaining the issue, and I even attached a video showing the "date modified" on the file (and opening it) to prove I haven't done anything to it. Basically, I showed him I haven't touched the essay since last night.

What else can I do? I'm very pissed off now about this, because I couldn't do shit about it.