Piracy but not on the high seas

I mentioned internet piracy ("Oh here he goes again!" -yes, I will because this is my only income!) but what do you do or call it when a printed copy of one of your books appears on a (in this case) Polish site selling odds and ends yet you KNOW that title never sold and you were never paid for any sale?

The only people with the publishing PDF was me, the POD company and the printers they use in different countries WHEN a copy is ordered.

This has happened three times and the POD (Lulu) response to my query? Absolutely not one word. Someone was making money on the side.

In case you wonder this looks like it was placed on a floor to photograph. And the yellow box on the bottom right with "New edition" was the temporary version between original cover and the new 2010 cover.