Tired off being taken for a ride

I bought my Nissan from IC Auto Roodepoort in Nov'14. The Sales Manager promised to fit a new side mirror which took forever. It caused me to go to Nissan several times. Eventually they got the mirror, but it was the wrong mirror. While driving the mirror would vibrate which caused irritation. AGAIN I took vehicle back. A very arrogant Dealer principal came to have a look, told that there is nothing wrong with it. As soon as i left, the vibration was back. Took it back again! Correct mirror fitted eventually. On a trip to FS the cruise control stopped working. Took the vehicle back. Workshop advised that it is broken &amp