Failure to deliver and failure to refund

I ordered an HP Laptop, a mouse and case on 26 Feb 2015, which was listed as in stock. Per the website I was expecting delivery within 2 days. 5 days later, still no delivery. I contact HP Shop and spoke to Habbib, who explained the mouse and case were out stock and could bnot be delivered by when I needed them. I cancelled the order on 3 March and they promised to refund once they received my banking details, which were sent on 4th March 2015. To date no refund has been received. I phoned Habibb on 8 April and he promosied to look into it and phone me back within 1 hour - needless to say, he has not returned my call, and calls to his mobile and landline go unanswered. I have reported the transaction to the FNB Visa card division as a *****lent/disputed transaction.