incorrect refund

I accidentally paid the wrong amount over to game and immediately requested a full refund(as my bank could not reverse the transaction). First they refunded the incorrect amount (after many many phone calls and e-mails to confirm when I get the FULL refund). I spoke to the manager Jayden who said that the rest of the refund will take place on Wednesday and admitted it was a mistake on their behalf. It is now Thursday and I have not received any payment. It was an honest mistake on my behalf (i said that they can penalise me) but what Game is doing now is inhumane. I am pregnant and this is causing so much stress as this is money that due to me.