Hire a criminal attorney or if you are eligible, request a public defender, immediately. You can search for an attorney on Avvo or contact your local bar association for a referral.
Nothing about your termination supports a suit against your former employer for wrongful termination. Assuming you were an at-will employee (without an employment contract or union membership), your employer could terminate you at any time for any reason. They did not have any obligation to investigate their concerns before terminating you.
If you can prove that they lied to police, you may have a defamation claim against your employer. However, you may have trouble using your recording as evidence. Speak with your criminal attorney about the possibility of filing a claim against your former employer. If your criminal attorney thinks you may have a case, ask for a referral to someone who can handle the civil case.
This answer is provided for guidance only. DO NOT rely on it as legal advice. We DO NOT have an attorney-client relationship. You should contact an attorney in your area for a one-on-one consultation before pursuing any action or making any decisions.