Contruction Materials Lien

[John B.]

A friend of mine (honestly), lets say Jim, in Milwaukee hired D & G Xteriors, LLC to side their house. D & G Xteriors worked with Jim's insurance company and got the insurance company to issue a check to Jim. Jim paid D & G Xteriors with a contract that included a lien waiver. D & G Xteriors got his materials, $3,000 worth, from Richards Building Supply but never paid them. Richards Building Supply has now given notice to Jim that they intend to file a lien on Jim's home in 30 days.

What is Jim's remedy?