Hmm what if you said something like...
I contacted Western Union and they said the payment has been confirmed from me but they have placed a hold on your merchant code due to suspicious activity. I assume its because your in China but your website is in Panama. They said all you need to do is visit a Western Union in person with an ID and they will be able to disburse the payment. I guess this is something new they are starting as I have never run in to this before