I recently designed a magazine for a company in less than half month. It sounds impossible, but we did it with working over time every day until midnight and weekends. I was hired as independent contractor to create the design for the magazine, and worked with the project manager and editors. They provided all the articles and images, but I was the one,who design the whole magazine. They told me that they will consider this project as a first toward the full time employment. Because of this, they offered very low pay for the project. However, they did not hire me eventually. And, they told me that they are going to take out my name completely from the credits page. I read something about "work for hire" copyright issue, which is similar to my case. Can I file law suit because of it?