I completly agree Dan.
Typically, in order to be enforceable a contract must involve the following elements:
1) A "Meeting of the Minds" (Mutual Consent)
2) Offer and Acceptance
3) Mutual Consideration (The mutual exchange of something of value)
4) Performance or Delivery
5) Good Faith (It is implicit within all contracts that the parties are acting in good faith.)
6) No Violation of Public Policy
You should seek the advice of a lawyer for a definitive legal answer.
Great question for an attorney. The law is not what we specialize in there and at the heart of your question is a legal matter. It's going to come down to what each side can prove and what the law considers proof. I wouldn't wait any longer or pay any more before I got this in front of an attorney.
What matters in real estate is properly signed contracts everything else is essentially idle conversation.