Not happy

I bought a Hyundai i10 at Inspectacar Centurion. The radio just stopped working. Im staying in Potchefstroom. Drove to Centurion to try and get my radio sorted. Did not get it sorted. Now i have to go back again. I even offered to give money to help put a aftermarket radio. They wanna send the car to Hyundai. I went to Hyundai Centurion to find out the factory radio costs R41000 for a new one. Im very frustrated about this whole thing. Im just wanna cancel the whole deal.