MAZDA HILL STREET, MORE LIKE MAZDA HELL

Mazda Randburg have no idea in how to fix their own cars. I have a Mazda CX3 - this car is not even 2 years old. Since October I have not been able to drive my car for a week combined. I have taken the car in 4 times, today will be the 5th. They do not bother to keep you updated, but this is actually because they are not doing anything, the service manager Paula let it slip that instead of sorting out the car it had been parked in their parking lot. After many promises, Mazda said the car was working, I got it home and within 2 hours the lights went on! I phone this morning and the service manager is too busy to take my call. What can I do? I am paying over R6000 a month + insurance for a car that sits in Mazda, oh and that does not include the money I have spent in labour and parts ................... what happens to the service contract? I am paying for that as well.