I think that providing you get your money through whichever means necessary, then this sends out the message that you're not to be messed with.
I'm not talking about doing anything illegal, but threaten them with the small claims court or declare bankrupcy on them.
Remember the golden rule. People talk. Whether it be housewifes nattering over the garden fence or businessmen doing lunch. Stories get passed around and word gets out.
I doubt there's an incident happened on this planet that someone's managed to keep entirely to themselves. We all communicate. Anyway i think you catch my drift by now. Just make sure they pay up eventually, even if it means badgering them until you're 99, because once word gets out that you've been had for a free clean then everyone and their dog will be trying it on.
Lance (As the mounties say, i always get my man) No not like that you pervs