Being misled on buying a car at EERSTE GELUK MOTORS in Bloemfontein

I recently bought a Ford Kuga 2.5 Titanium 2012 model light blue in colour from Hendrick Schoeman at Eerste Geluk Motors (EGM) in Bloemfontein. The time I want to reverse the sale of vehicle as I was deceived and not satisfied with advices I've received from Mr. Schoeman the manager refused via email. Firstly my main objective was to buy a car that is going to used on the field as my wife is working for Old Mutual with a reasonable fuel consumption, Hendrick recommended me a Ford Kuga 2.5 and verbally guide me on how to drive it in order to keep the consumption reasonably but still the consumption is not manageable according to my spending on fuel and that simple shows me that I cannot afford a car in the long run as he **** to me and the car doesn't serve the purpose. Secondly the car came without spare key which led to me being quoted for according to him. Thirdly there are some minor dents at the back of the car noticed while busy washing the car and they seems to be too old, he also did not inform me about them. Lastly I assume there's a problem with the gearbox, socks and brake pads and I booked a car for a quality check and is scheduled for the 13th of this April 2018. I only have three weeks driving the car but already spent more than R2000.00 on fuel. I feel misled by the person I gave trust on to as a specialist. Please test drive their cars first before you conclude on buying and don't take any advice from sales executive.