Purchased demo vehicle 3 Jan 2022 and already had 2 services and havent even paid the first installment

Firstly I would like to thank Nissan Ermelo for the amazing service I have received from purchasing the vehicle and also addressing the issues I have had so far with my vehicle. Ermelo, I was assisted by Mbali, wonderful lady who has really communicated well and ensured that Im assisted to the best of her capability. I purchased the nissan micra, 2021 model on the 3 jan 2022. It had an engine light that came up, spoke to Mbali and she managed to assist me to have it checked at Northcliff nissan. The first consultant to assist me was Mark, he checked the vehicle on 21 jan 2022. He indicated that he reset the warning light and said it wasnt an issue. On the 26 Jan 2022, the light came back on and I informed Mbali again who informed me that I need to take in it again as she was also worried cause the vehicle is a demo and shouldnt have any issues. I then went back to Northcliff and was now assisted by Alex, he was very helpful and explained things so I am comfortable with the process of how their are trying to resolve the issue with my car. Since their were not too sure about how long the matter will be resolved, I then enquired about a courtesy vehicle. I was informed that its in house insurance and the excess is R40 000. From the bottom of my heart, I bought a fairly new car and since taking the car, ive done 400km which is nothing really. Im trying to understand how Nissan can offer a courtesy vehicle of that high excess and whats worse is that the vehicle was from Northcliff but the way things are been done, Im highly inconvenienced and now left with no car and not knowing how long the issue will take to be resolved. I am seriously angry and not happy with the service I am receiving from Northcliff excluding Alex, its not customer friendly cause they even stated that the light was not from my own doings but as a new customer to nissan, im not even been accommodated. I havent even paid my first installment already my vehicle has been taken in twice for service and i am not left without a car and waiting to see how long it will be resolved.