“OT” problems with ebay buyers, what to do now?

Evening, this evening directly the 2nd thread^^ I sold my Rainbow SLX 265 Deluxe over Ebay about 1 1/2 months ago….And that’s because I ordered the phase Evolution CFS 165.25…. Well, at the beginning of January (interestingly shortly after I rated positive) the buyer of the Rainbow has registered and claims that the right TMT is broken….He would clutter even at the lowest load! But the system was 100% technically faultless by me. I have excluded warranty / withdrawal in the auction, but the buyer wants to go back to the police and report his money to the police! And his dealer, who has installed the components, would also confirm to him that the TMT was “shot down” by too much power… But I never added more than 2×70 Watt RMS of a Next Q-12, and it is also not exaggerated with the gain…. I really don’t know what to do anymore.