Tired of paying to be Hyundai Strydom Park's guinea ***

I drive the Hyundai Santa Fe which is a 4x4 SUV. Over a number of years I have been complaining about a ''knock'' coming from the front left of my car. At every service the suspension was tightened. Never while the vehicle was under warranty was I told to book the car in to be inspected. Only this year does an adviser advise me to book the car in for an inspection. Inspection completed I received a hefty quote which the service manager was kind enough to reduce to to my issue being ignored over so many years. Happy days, I pay and they repair the left hand side. Driving home I realize that the suspension is still not right and I notify them immediately. The car goes back, now I get told they have to repeat the work on the right hand side. So I get slapped with another quote. I also informed the service manager that the knock is STILL on the left hand side. He has taken the matter up with the dealer principle and I get shrugged off with a ''let me know if I must order the parts for you''. My gripe is, I am being treated as a guinea ***, the workshop should've done a proper inspection. Over the years this problem should've been addressed by the dealership. I am not an employee there so I re**** on their expert advice every time I complained about the noise. I am now a couple of thousand rand out of pocket and still have the exact same issues with my car INCLUDING the left hand side which they claim was fixed. I will not leave this matter here. I feel cheated. I have tried reaching Hyundai through FaceBook but that was also a waste of time.