I've had some questions about MoneyGram.
Moneygram has allowed me to send funds, get to the door of the store, and call me back telling me they are not comfortable with the transactions and force me to pick it backup insides.
I will sell BTC for MG if you are willing to take the risk, otherwise that is the extent of my use of them. If they did cancel the transaction, you would get a refund from MG in the form of a pick just like you would receive money.
Is this because of the frequency of transactions done through MoneyGram, or because you were (possibly) sending funds to someone that was flagged on the finCEN or other blacklist? Was this the first time that you used them?
I have to imagine the same type of limit could have been put in place by WU to the same recipient. After all, these money services businesses access the same blacklists and have near identical reporting and AML requirements.