Refund my debit card asap!!!

I purchased an item at Game, Mall @ Reds on Saturday 16/05/2015 and returned it back on Sunday 17/05/2015 for refund. Upon my return, I was told by one of your Customer Service Consultants that my debit card will be refunded with the appropriate amount within 48 hours. To date I have not received anything from you guys. I have confirmed with my bank and there is not even a pending credit from you. I have called the store and they just send me pillar to post, as they do not know their story or in fact perform their job. Why can't I get my money back within the turnaround times as promised? I need this matter to be resolved asap because that is my money and I need it!!!!