Hummm. I think you would have to contract someone in the state the contract was made in.
Send them a Certified letter to start with.
That is the first step letting them know you are serious! Make sure you have the letter notarized that way they know this is a legal letter, and will stand up in court. If all this fails, call the Court house in the county which the contract was made in, ask them their advise as to what you can do? This would be a start!
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