Bad Service and Quality from Renault SA

I purchased a Renault Kwid in March 2020 from the Renault dealership in Germiston. When I collected the unit I showed the sales guy that there are marks on the grill. He told me that he will sort it out but it will be after the log down is lifted. After the lock down was lifted we didn't get any feedback from him and we had to contact him about the grill and the number plates and license disc. We also found while driving the vehicle in lock down that the brakes was noisy and we also reported it to him. We battled to get any answer from him on the grill/number plates/license disc and the noisy brakes. After some time we contacted the Dealer Principal and complained to her about the problems and that we are not getting any response from the sales guy. She arranged for them to collect the vehicle on two different occasions and on every time they bring it back and tell me that it is fixed , but the brakes are still noisy. The Dealer Principal asked the workshop Manager to contact me and he explained to me and he send me a technical bulletin from Renault SA from 2015 that there is nothing that they can do about the noise we must drive the vehicle the noise will go away. I send e-mails to a few persons at Renault SA but I don't get any response. If they now about a problem on a vehicle then they must inform you when you purchase the vehicle. But I think what make it worse is the bad service or no service from the dealership and Renault SA.