How do I get the payment?

I'm in Taiwan. I get a customer in Gardena, CA. They buy the machine parts from us 2005. We ask them for the payment but no respond. E-mail, Fax, Phone calls all no respond from them. And I know they are not closed. What can I do? (not to tell me to get to their place.)You can sue them. If it's $5,000.00 or less, you can do it in small claims court. You will need to send a representative or hire a lawyer here, but you may be able to add that to the cost. Here is the court in their district, and a person will be able to help you.
http://consumer-affairs.co.la.ca.us/tsSC...
.if the amount is significant like over 1k ask your local business bureaus. in the U.S. business bureaus are in every other town. so is pretty common. i suggest you go to an U.S. dot gov. site to better find your answers. google key words like consumer report and things i mention above and search under gov for government.