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.