Laptop returned for the SECOND time

I bought a brand new Dell laptop from Greenstone Dion Wired. I had it for about a month. One morning when i turned the laptop on and it was a "blue screen". I returned the laptop to Greenstone Dion wired and was told that they will send it back to Dell, but it would take up to 21 working days!! I received the laptop back after roughly a week and was told that eveything was working fine. I had the laptop for about 1 week and then i got a blue screen again!!! I took the laptop to Mall of Africa Dion wired and was told when he looked on the system that the laptop was never returned to Dell to check. It was just "sorted" out in store.? This was not what the Greenstone Dion Wired had told me! The laptop has been with the Mall of Africa Dion wired for a few days, and every time i call, they say that they are going to call me back and no one ever does!! I asked if they can save some stuff on my hard drive as there are photos on there that are irreplaceable!! They say that they will call me back but no one ever does! I have been trying to call them for the past 30 minutes and the phone just rings and rings! This is highly frustrating!! Ridiculous service! I will never buy another product from Dion Wired!!