Makro selling grey goods

In July 2017, I purchased a Dell laptop from Makro Centurion. Although incredibly slow, it worked fine for several months. After a while it started overheating and giving the blue screen messages. The messages reflected that there was a problem with the hardware. My son in law, an IT expert, monitored the messages as we were unable to use it without it constantly bombing out. I put a complaint on their website for someone to contact me, but heard nothing. On 8th December we took it back to the store and were told it had to go back to the supplier for assessment and would take several weeks. Three weeks later, the laptop is still at Makro with their staff interfering with it. They wanted my password so they could access my personal profile, but we refused it. They do not need my password to send it back. I am now told that they give a 10 day warranty on their stock and it is thus out if warranty. I understand there is a 12 month guarantee, so where does this come into play? I have neither the laptop nor the money, is it assumed I paid R9000 to the Makro foundation? Please respond to my complaint as I wish to take it further.