You haven't described the circumstances, but if you haven't been paid it most likely that the client is short on money, and that means there's probably a bunch

You haven't described the circumstances, but if you haven't been paid it most likely that the client is short on money, and that means there's probably a bunch of other people who haven't been paid either. The one to get paid first will be the one who is most annoying. Be the most annoying.