Paid for falsely advertised product with no refund

I recently searched online for a Playstation 4 gaming console, and after much comparisons were made, I decided to purchase the product as advertised from [URL Removed] online store. Two full days after payment had been made, I was regrettably informed that the product was in fact not available to order. I was offered an in store credit which is ridiculous in this instance. I have been trying to get my money refunded since I was informed about the lack of supply. I have sent countless emails, and made numerous phone calls regarding the refund, and have been told that that the refund has been placed under consideration. Is there any possibility that I won't get my money back?! What has to be considered here? i provided my banking details immediately. After almost two weeks, I have been told three times that the payment to my account has been made, which means that the first two times I was told were a lie. Today (13/02/2015) I was assured that the payment for refund had been made three days ago. I have now received an email asking me for my banking details. I cannot even begin to describe how unprofessionally this situation has been handled. I still have not received my refund.