Poor Service, Customer care, and poor quality vehicle

I bought a NIssan Qashaqai 2014 model in 2014. This care has been giving me problems within the first six months that I bought it. 1. The car would not switch off the radio even when its off and locked 2. The car would just reduce the speed in the midle of a drive and give me a CHASIS CONTROL SYSTEM FAULTY warning on screen. 3. 2017 took the car in for service at Boksburg Eastrand mall Dealership. They were to do a major service and install new brake pads and clutch only. to my suprise when I came to collect the car I was told that my car is no longer starting. The stayed with them for 3 months. They fixed this car under warranty. 4. I was given the car back after 3 months. When it came back I noticed a noise coming from the engine. when I went to the garage I was told that there is no oil inside and it was empty. There was no warning sign showing nothing. I put 4 pints of oil. After that I continously had to keep buying and putting oil on the car. I then had to take the car back to the dealership to report this issue. I did this three time and in all these times they couldnt find any leaks and anything wrong with the car. 5. 2 weeks back on a weekend while driving on R21 the vehicle again gave the same warning and redused the speed until it stoped. I tried to restart it and it wouldnt go until it started giving out lots of smoke. I took the car back to Boksburg Dealership and its been there since 18 of June. 6. I am continously without a vehicle but am paying monthly installment of which my company contributes to. My job depends on me being mobile. I have contacted Nissan South africa regarding this issue but they are dragging their feet in assisting me. They keep saying they are doing investigations and assessments and they can only assist me with a temporal vehicle only when these assessments are done. Car dealership claims that they dont have vehicle to loan me. I will never ever buy a car from NIssan ever again. I am frustrated and exhausted by their lack of compassion and customer care. I am about to loose my job because of them.