It may be easier than small claims or sending threatening letter. Something along these lines happened to me in New York state. I consulted a labor lawyer who p

It may be easier than small claims or sending threatening letter. Something along these lines happened to me in New York state. I consulted a labor lawyer who pointed out that this was in fact illegal in the state of New York. He actually suggested I contact the state AG office. Once I explained to my former employer that they could be fined they paid up quick. Check your state laws.