Refusal to produce proof of service and roadworthy

I purchased a Mini Cooper at McCarthy in December 2014, Schoeman branch in Pretoria CBD. I requested the car to be serviced in December 2014. I handed the car back to McCarthy, specifically to Simon Mmidiwa in the same month as the car needed to be serviced. He called to say the car has been serviced. I went back to fetch the car. I approached Mini Cooper in March 2015 for service history of my car as the service book is empty. The records given to me on 06/03/2015 by Mini Cooper showed that the car was last serviced in 2013. I went back to McCarthy on 02/05/2015 showing them the print out of service history from Mini Cooper. I then requested proof of service from Simon since he assured me that the car has been serviced and that it is roadworthy. He failed to produce the proof. I was told to wait until Monday midday and they will get back to me. They haven't contacted me as promised. They have not given me proof of service or proof that the car is roadworthy.