North Shore Agency; sending letters to collect a debt I don't owe; their "client" says they sent me a book... since I didn't order it, it's a gift per postal regulations Melville New York

They have been sending ever-more-sarcastic & nasty letters claiming I owe "RDA Enthusiast Brands, LLC" (or Taste of Home, depending on the letter) money for a book they claim to have sent.

First off, if they sent something I didn't order postal regulations say it's mine for free. (And I NEVER agree to automatic billing or ordering.)

Second, what book? The postal carriers here have a documented problem, over months, with leaving packages in plain sight. No surprise things get stolen.

Third, they have offered no proof, other than their "client's" claim, that the book was sent, let alone delivered.

Fourth, their form letters read as though they haven't seen/read my previous responses, outlining the above.