www.abiworld.org has an article about this company as a repository for negative credit info on up to 80 million accounts. Click on bk headlines in the middle of the page and it is the 2nd article.
Good grief! It never ends. They also do skip tracing - the theory that these below-the-radar consumers will show up applying for cable or other services, and can be tracked down with their database. http://www.teletrack.com/