Again, don't be confrontational about it, don't make accusations. Be polite & reasonable & if they refuse your request for such documentation, tell them you are "confused," not that you are angry.
The trick is that you are documenting yourself asking for something that should be perfectly reasonable.
They told you to use AI & you sent them evidence that could be dangerous. That's what happened. You're just asking them to put that simple, factual circumstance into a written acknowledgement.