Game Instant Money Transfer

Today I've send the money using someone cell no because my phone was of at Game Carnival Mall. After 10 minutes when I call the person which I've sent money to the phone is on voice mail but I haven't given the person pin number to withdraw money. So decided to went back to Game with my receipt as a proof of my transaction and my ID to get my money back but only to find out the money has been withdrawn without a pin. So point is how can money be withdrawn without the pin. Also how can game can't help me with the receipt and ID showing that I'm the person deposited the money.