A DISAPPOINTED UNIVERSITY STUDENT

I'm a University student and I bought an HP laptop from makro on March this year. On July the laptop started freezing while I was doing my assignments so I decided to write makro an email explaining the matter. They logged in my return and the courier guy took the laptop(this was 3 weeks ago). Since then I've been told to wait for an update and I haven't been able to do my assignments. I have a lot of assignments piling up and the due dates are near but I still haven't had my refund. I've sent them alot of emails explaining how crucial it is for me to have my refund but they don't even bother answering. I'm very disappointed that I used my last cents to buy a laptop expecting it to last for a while, for it break down not even 6 months while using it and for Makro to delay my refund.