Forget about the lies of Western Union. Here the real reasons what is going on with your frauded money.
Western Union is the fraudster and make them to send to you a copy of the receipt from the stolen money. They will not do that and that means that they robbed your money. Attached the last part of an Agreement from 2004 between Western Union and the US Attorney Generals; a necessity when someone wants to commit fraud.
So: Western Union is committing the fraud with self employed stuff. Remember: The "Nigerian Connections" never existed as they all had been self employed Western Union stuff that had been schooled and marketed by Western Union as Western Union, of course, cannot do it in their own name.
Monetary Loss: $19000.