You need to hire an attorney. Look on this site for local litigators or contact your local bar association for referrals.
This answer is for informational purposes only and is not legal advice regarding your question and does not establish an attorney-client relationship.
You likely have a breach of contract action - and should retain legal counsel in Ohio (see listings under Find-A-Lawyer on Avvo.com). If you don't pursue your legal claim you will not get paid.