No care for customer needs.

I have a 2021 reno Duster, when i took my car in for 45000km service at renault the glen my car had a knocking sound. They said they reset the gearbox and the noise was gone. After a few weeks the noise came back worst. I took my car to renault the glen and they booked my car in on the 25th of March. They mentioned it's injectors and SA RENO needs a fuel sample before they can fix as my car is under warranty. However the turn around times is ridiculous as they are not providing a courtesy car. Renault the glen doesnt have and SA reno said only after the claim is authorized and only after 7days will they give. so i need to be without car for weeks because of this poor service. I am a customer of renault for years. I am very disappointed in the service and i will never buy a car from renault again and i will share this extremely poor service with others. When i get through to renault the glen they say nothing they can do. No effort what so ever. Renault SA hope you take this serious please. I need my car fixed urgently or provide me with a courtesy car. Agent at renault is Gladness and i spoke to Mbali at renault SA. My car is with the dealership since Monday and no positive news. i pay over R8200 for my car. i don't think this is very fair. Also to add my car was booked in on Monday only on thursday did the glen send the sample