Ok. That may be true here, but that's not really a legal method for obtaining your wages. I'm not necessarily saying it is illegal, but my point is that I'm an attorney.
You posted this in employment law, asking it as an employment law question. Law is my expertise...not international IT companies or, more specifically, the employer in question here.
So, when I answer, I give you the answer under the law and how you can go about compelling a response through our administrative law and court system. The rest of what you are talking about, while perhaps very true, has nothing to do with my profession.
I can't really answer you in any way other than I have. If you feel that you can exert pressure through client contact as a means of influencing the employer, then by all means do so....but that is not a legal (use of the law) method of responding...it is a business/personal level of responding.
If they respond to it, great. If they don't, then you'll still end up with the options that I have stated here, which are to file the wage complaint as I have already noted or sue in state court.