I want my money back

On the 21st of July I bought Philips 1000 Series Analog Airfryer 6.2L for R799 at PnP hyper Maponya Mall 14 days past and when I use it it automatically switches itself off before it finishes the job. When I take it back they said it means to be booked in for repair. What must happen in th meantime because I need to.make pies for my kids. I'm not happy