Faulty Nissan Magnite Acenta Plus 2021 1.0 Turbo CVT

On 7 Dec 2021, I purchased a new Nissan Magnite 1.0 Turbo CVT with some extra's added to the vehicle. I drove the vehicle off the show-room floor at around 16:40 that afternoon. At 17:57 a fault error appeared on my display stating "Check Hill start assistance", one minute later another fault error message appeared stating "Check ESC". I called the sales person who I bought the vehicle from and he told me to check the vehicle in a couple of minutes as I was at the shop at the time and if it appears again I must call him back. At 19:02 I drove back home and the same 2 error messages appeared and then a 3rd one appeared with the message "Check Anti-pollution system"...this error popped up whilst I was speaking to the Nissan Sales Person who I bought the vehicle from. The vehicle was collected from me the following day to take to the service department to sort out the issues. On Friday 10 December 2021 I was told that the vehicle is fixed and that they drove about 50 or 60km with the vehicle and it is now okay. I collected the vehicle on the 10th December and after about 2 hours, the error messages appeared again and the car became sluggish where I almost didn't make it back to the Nissan dealership as they vehicle felt like it was losing its power completely and almost feeling like it is coming to a stand-still. It is now the 14th December, one week after I purchased my new vehicle and I'm still without it, it is still sitting in the workshop. Today I was told that they could possibly help me with a replacement but that it would be a lower spec vehicle and that the finance team need to redo the numbers etc.

I'm just finding it very frustrating that I purchased a brand new vehicle and haven't had the experience of driving this vehicle and that Nissan SA is just quiet during this whole process.