Site content is typically considered to be Intellectual Property of the author (assuming that it is original content). If they are copying content word for word it very much sounds like they are guilty of copyright infringement here.

Unless you can prove and document monetary loss sustained by your business as a direct result their infringement, the most you can do is have your lawyer send a "Cease and Desist" letter. You can threaten to take them to court for failing to comply, however I'm not sure in a case where no monetary damages are found to be had that a judge will take time to enforce it.

At the very least, you might be able to strike up a compromise where they can display the copy on their site, provided that they cite you as the original author and provide a direct link to your site.