The opportunity cost of pursuing this is huge. Cut your losses at 100 hours and spend your time looking for new clients.<p>Spend $5 and buy a used copy of "The Check is Not In the Mail" <a href="http://www.amazon.com/Check-Not-Mail-Without-Customers/dp/0962483354" rel="nofollow">http://www.amazon.com/Check-Not-Mail-Without-Customers/dp/09...</a> it will give you a number of suggestions for how to structure an engagement to avoid some of the problems you faced here.<p>The real warning sign on this was the inability of the company to set a date for a partial payment, telling you to "be patient" instead.