I'd put it down to experience to be honest. Its never happened to me before, so don't know how I would react.
IF I was ripped off by some pimp, now THATS different, I'm a bit tasty and can look after myself, so if it looked a 1:1, I'd take my chances, HOWEVER, if it were a couple, and THATS the way the spineless wankers act, I'd slink off a few quid down.
I'd then round up a couple of lads and go back and make bloody sure it wouldn't happen again