Poor Service @ CMH MAZDA RANDBURG

I bought a secondhand car (Mazda cx3). Shortly after buying this car. The car all of a sudden showed that it needed service. Sent the car for service and they told me that the brake pads and need to be changed and my battery needs to be changed. Car is also showing that needs water when it doesn't. Lastly my key does not work. Sent it for that and they requested the second key which was also not given to me when I bought the car, made a complaint and I have since been waiting for the sales manager to call me.