You can find the documents to file breach of contact, online. Do searches (google) then see what you may need to do, forms are online, free, you can file.
It is usually better to have attorney, can you get one pro bono or through your state legal aid?
These J#$Ks that do not pay..

There is legal aid available through womens and childrens alliance, but there is quite a wait. Worth a try, though