Me and my mate got conned by a German drug dealer, and a couple of his mates in Marbella about 15 years ago.
To cut a long story short, he owed us some money... we asked for it back politely... he said later... we kept asking politely... he said later... we tried to put pressure on him by saying we'd goto the police... he turned very nasty and threatened to have us beaten with bats by local friends... we decided it wasn't worth a hiding, and decided to slash the tyres on his Audi, and brick the windows of his apartment and business. We then proceeded to shit ourselves and jumped on the first bus to Seville.
I think we got our money's worth lol.
Seriously though... Marbella's a lovely place. Just don't speak to any Germans with dodgy mullets.