Also if your dealings with this compnay/person was done over the internet, and more importantly if their product with your material in it is offered over the internet, you can go to this federal goverment site and file a complaint.
http://www1.ifccfbi.gov
Why hire a lawyer when you can let the government do the work for you? Especially if your corrospondence and promises of payment/wage was of the majority done over the internet/email. The government is cracking down more and more on Internet Fraud, make those feds earn their budget and salaries.
Also without you recieving payment the rights and title(copyright) of the material they used still belongs to you. So you can get them on two federal charges at a minimum there.
Also, as long as either you or the company is located in the USA - doesnt have to be both of you - that government link above is still a viable option. Also as long as one of you is located in the USA and depending on which country the other party is in the copyright infringment angle is viable too.
If your both in the USA you can also try getting them under Labor Laws. I would start with your state labor board(unemployement office, workforce department, whatever they call it in your state.) And they can point you to the correct resources/persons. If your both in different states then you can look at federal labor laws helping out. Your state labor office can help point oyu in the right place with this too. BBB in this case probably wont get you anywhere except maybe point you to the proper resources. Your liable to get more help and information from your local SBA office.
Actually the SBA is more apt to be able to coordinate things for you. Even to the point of giving you a free lawyer to handle it. The SBA actually gets funding to help pay for or subsidize folks in this type of stuff. Though you may have to use a prybar to beat it out of them.
