Bad Service/Faulty Car from Toyota

I bought a brand new Toyota Double Cab Diesel from Imperial Kempton Park. 3 wks later, the car stalled while driving in Mpumalanga on (07/04). I called Toyota SA and the Car was towed to Barloworld Toyota Middelburg. Since then, it has been 11 wks of buying parts and daily excuses, but I still don't have a car. no courtesy car from either Barloworld/Imperial or Toyota. don't have car with me. I'm extremely frustrated with the treatment I have received from this company. if you cannot fix the damn car, can I just get my money back or another car? I am deeply disappointed and beginning to lose faith in the Toyota brand and the ability of the dealerships that Toyota uses to effectively deal with the problem and not inconvenience me any further. Will Toyota SA head office intervene please?