[tzs]

You have a contract. You just don't know the terms.

You might be able to guess them with sufficient knowledge of the law of your jurisdiction. In the US (other than Louisiana [1]), you'd need to know at least State and possibly Federal contract law, common law, and a bunch of court cases.

[1] Louisiana based its law on French and Spanish law, which derive from Roman law. The other 49 states base their law on English common law.