Ahh, the famous Missouri Argument, favored by Internet Libertarians of all varieties. What can you do about it? It's so simple - If I'm under contract, I must be able to point to a piece of paper that details the contracts, right? And if you can't produce such a thing, then any and all action taken against me is unlawful (heh) aggression!
With less ranting, here's the usual formulation:
Q: Can you please show me this contract that I signed obliging me to the agreement that you speak of, please?And if you'll read on, I'll explain just how it is that you're under contract: