Speaking from experience: Western Union is awful. Absolutely horrible. They basically stole $50 from me after their representative typo'd a number and then didn't have the authority to fix it, and then I was asked to prove my transaction by faxing them a receipt which I hadn't kept, therefore losing my $50. Avoid them at all costs.
The form you filled out when you sent the money had carbon copies, which are retained. If data from the form was mis-typed later, they should be able to check their copy, or you might be able to retrieve a copy from the outlet or receiver or something.
I assure you that no-one in WU is trying to steal $50 from you. Mistakes happen, but there is a paper trail, so if you really care, escalate. They operate under the supervision of your country's financial regulator, whom they are deathly afraid of, and are hardly going to risk their banking license pilfering fifty bucks.
The point is that you wrote a very damning indictment of a company, accusing them of theft, and I pointed out they could probably fix your issue if you actually cared, even without the receipt. You then admitted you couldn't be bothered going through the process.
So what you wrote was basically a load of crap. But hey, bitcoin!