Jaguar Land Rover West Rand incompetency, no accountability for their actions

I took my vehicle for a service into Jaguar Land Rover West Rand 4 Foster Lane, Weltevreden Park. 16 000km service which cost me R10 000.00, I then drove the vehicle for less than 5000km and then the vehicle started giving me problems. I took the vehicle back to Jaguar Land Rover West Rand 4 Foster Lane, Weltevreden Park and reported the issue to the service manager( Pieter) , he then gave me x4 1L bottles of oil for free to pour into the vehicle. The issue to the vehicle was still not resolved and the engine was still making a noise, I went back to the manager Pieter and he told me to pay for a diagnostic report then I advised him thats not going to happen because its not my fault that there was no oil in the vehicle. I hired a private engineer which cost me and he told me the vehicle has a bearing knock due to no oil in the vehicle. The vehicle has no oil leaks and this means they never changed the oil when the service was done or less than was supposed to be added into the vehicle. Ashley Kruger assisted me with the vehicle diagnostic report