Renault Kiger taken due to overheating and jerking but the dealership and Renault won't assist me with a vehicle while they working on my car

My renault kiger (which I bought last year may, currently 16000km) was overheating and I called the dealership and got towed to the dealership on Thursday. The problem is I have no car and they don't want to give me a courtesy car while the sort my car out. This is a warranty issue and they are telling me about having to wait for 7 days after the part has been ordered. The warranty claim was approved but the part still hasn't been ordered so which means my 7 days of waiting still hasn't started. I called Renault SA and nobody is assisting me with the current mobility but all of them are telling me about their procedures which don't consider us as their customers. No report as yet has been provided to me formally to let me know what why my car was overheating and what is causing the jerking on the car when I press or release a brake. Furthermore I'm expecting Renault to explain why such a new car has a "faulty water bottle". This is totally unacceptable from Renault and their dealerships to give us such a poor service.