no it isn't. why you did not sue them? success rate of international arbitrage (New York Convention) proces into China is 90% success rate. USA/EU companies who sue Chineses companies in China for breach of contract seem to be winning rates. Enforcement of USA curt orders do not need to go thorugh Chinese courts again, and are enforced by local authorities (local sharks) with success rate of 80% for foreign firms suing chinese firms. fees are also fairly low. case is straightfoward.

if author went and sue, likely he would get his money back.