Fraud on eBay – what would you do??

Hello! As one or the other will be known, I have bought a “new” Hifonics Colossus XI Final Edition on eBay for 560Euro. Here’s the link:http://cgi.ebay.de/ws/eBayISAPI.dll?… So far so well, everything had worked out and the final stage arrived and looks really brand new. The invoice was with 399Euro. The seller said it was a inventory bargain. Now the Colli smoked after only 5 hours of operation (for whatever reason). The nice (really, very nice) gentleman said that although on that day a Hifonics Colossus XI was sold at the MediaMarkt, but not a final edition. The invoice sent by the seller is definitely not from the Colli Final Edition. Thus there is no guarantee and I would have to repa I asked if he is so nice and first makes a quote. He says no problem, he does. The power amplifier is not new either. With only 200 produced devices, Hifonics knows exactly where they were delivered. The one I had bought was already at repair!!!!! So the power amplifier is neither new (but only renewed/repaired), nor is there an invoice with warranty for this device. What would you do. I HOLD now proposed to the seller , that he pays the repair and to me still 100Euro as “reparation” and value loss (it is not new and has no guarantee). So far I only wrote to him, explained the situation and asked him to contact me as soon as possible, because otherwise I will go to the police. So far no action of him (is not yet long ago). Groundless impudence, right? What would you do in my place??? Thanks already for good tips!