It is best to find a mediator to stand between the two parties and help both sides understand the other side's point of view on the matter so that they will reach a settlement. None of both sides are bound to whatever decision the mediator ends up giving. The local courts recommend arbitrators and mediators. Several nonprofit associations such as the American Arbitrator Association may have the mediators and arbitrators to help you resolve your issues. There will be fees involved in such a resolution, and it depends on the location and complexity of the case on hand, but it won't be that expensive given that both parties share the cost of the litigation.
It would be advantageous in your part if you hire a lawyer that has experience with such cases. The lawyer will assist you with the whole process, from filing the case which most likely will cost you about $250 to $800, up until the claims will be made. Another thing you have to think about is the fee for the services of your attorney which you might want to pay using a percentage of what you might recover