Don't waste your money! I've sent in my order a few days back, my payment has been confirmed for over 3 days now, I've tried to get some response via a support message; but nothing, no communication, the transaction doesn't show and the order is "pending". It seems that something shady is going on with their services, so again I would be very careful
I dont think this is GMs fault.
Something like this happened to me a while back..i sent the money to the exchange and got it confirmed many times in my wallet. Even looking on the blockchain i can see the coins at destination. I had to wait out about a week and they appeared there.
Supposedly this happens if you send it while being offline. I'm not 100% sure about this last part though.
Definitely GM is not trying to scam you.
I'm sure your problem will be resolved soon. Experience has shown that they react quickly and generously when problems like yours occur.