Hyundai so called service

Good day I need someone at Hyundai South Africa to get in contact with me regarding the ******* Brackenfell dealership. Never in my life have I encountered such pathetic service, blatantly lying etc. I bought a 2018 i20 from them in 2020 first they tried to pull one over me by putting a second hand set of mags and tyres on the vehicle, since then the vehicle has been in 3times for the aircon, 3 times for the gearbox and once for paint repair as my bonnet was bubbling. So I got my car back on Friday again being told that the thing is working, I've started recording videos so I can provide whoever with video evidence of the gearbox not working. How do I get a dealership that simply lies and doesn't do anything to repair my vehicle