I'm not a lawyer and this isn't advice... but it seems to me that kind of non-payment is probably the kind of thing you can resolve pretty quickly with appropri

I'm not a lawyer and this isn't advice... but it seems to me that kind of non-payment is probably the kind of thing you can resolve pretty quickly with appropriate legal action. A simple letter to legal saying, "your terms say you'll pay me X, it hasn't been paid. I'd like you to do so or I'll have to look at taking all appropriate steps to get paid." Will often get the right person to look at the issue. And if that fails actually filing the appropriate action almost always does.