Bad Customer Service. Poor quality products

I bought a laptop at Foschini after I have enrolled for my online studies this year. The laptop brand is connex. It started by being slow to on and eventually stopped getting on completely. I returned the laptop to the store at Canal Walk where I bought it. It was booked in for repairs, and from that day I haven't received any communication from them nor the supply, there is no turn around time for the waiting period either. Soon I am writing exams but I do not attend my classes.