Unpaid internship

I worked an unpaid internship over the summer. This was my first internship position. I figured the experience I would get would be beneficial for me in the long run and allow me to beef up my resume. At the end of my internship program, the company told me that they were rewarding me money for my hard work and would mail me a check. This was amazing cause I really needed the money. This check never came and it has been over 4 months. all my calls and emails have been ignored and I feel disappointed and taken advantage of. Is this even legal? Should I just move on and accept it?

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