A Miami foreclosure defense attorney known in the Hispanic community for his infomercials and legal advice program, has launched a whistle-blower offensive against banks that could generate hundreds of millions of dollars for cash-strapped Miami-Dade County.

John Ruiz, head of La Ley con John H. Ruiz, filed two lawsuits last week claiming more than 110 lenders haven’t paid as much as $700 million in fees required when filing foreclosures against homeowners. Separate from court filing fees, the county fee is intended to guarantee maintenance of properties in foreclosure.