In all honesty though, not paying the agreed sum on the basis of a "poor performance" is a straight-up bullshit if you ask me. It's a risk promoter does take when he books someone he's not exactly familiar with and I very much doubt he has any legal grounds supporting his claims concerning this matter. So he should shut up, pay and never book them again (probably advise everyone else not to do it as well). That being said, Indivision have proven more than once that they are in fact proper little cunts (at least one of them anyways), so this doesn't surprise me at all.