Unless it goes to court, they really don't have to show you anything basically, and remember they could have anyone add his name to it like he signed it.
Don't let them scare you, this is a common thing bad companies do, they go back two or three years and bill people money, and hope some pay, that is free money to them. Or hope you agree to some settlement and so on.
You can of course deny and say prove it, but if they are not honest that really does not matter until you get to court.
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