Direct Express Commerce Bank missing and stolen momey Internet

On December 6, 2012, I returned an computer to Brst Buy and they told me that the refund of 329 dollars  would appliy back on my card within 3 to 7 days. On the 9th of December I call Direct Express to see if the money had returned on my card and the customer serice rep told me that it would be place back on my card within 30 days. I called several times after that and recived the same answer. On the 11th of December, I order 2 pairs of boots. Later that day I could not find my card, so I card to replace my card there was an 871 dollar balance on my card and when I spoke to the rep, she told me that there would be a charge of 14 dollars for the replacement of my card, When I recieved the replacement I called to activate it, So a couple of days later, I went to the bank to take some money out of the ban so I can pay me cell phone bill. and the amount on my card was 701 dollars, I check my card several times waiting for the money from Best Buy again, So I finally, spoke to a rep again on the 28th of December. And that is when they told me that the money was returned,on the 8th of December. I tried to acess my acount several tie on the internet and each time was denied acess. One partically time when I call a rep told me that they have not recieved an anothorization from Best Buy to returned my money, So I had a customer service rep at Best Buy to send me the authorization.