Jeep Cherokee electrical and servicing problems

I purchased a 2015 Jeep Cherokee Limited in December and since that time the car has been back for numerous issues and I have complained to both the dealer and Chrysler. 

It has been back approximately 10 times now, sometimes for more than two weeks at a time, and without any success. 

They keep telling me it is the way I am driving, that my garage door opener is causing the electrical issues, or they cannot fix it as the faults are not showing up when they drive the car, so therefore there is nothing wrong with it. 

The car has now done about 5000 km. At about 1200 km the transmission and drive shafts were replaced. 

The issues happen intermittently, so they do not always happen when the Jeep mechanic is driving it. But two issues occurred when one of the mechanics was driving, and while reversing a loud bang occurred like you have hit something, they tell me it is usual and the answer is to turn off the reverse assist, so it doesn't happen. But I paid for this feature on my car and feel that if they cannot fix it they should give me my money back or give me a replacement vehicle. 

Both the dealer and Chrysler have refused my repeated requests. They advertised that the car would self-park but it doesn't. I paid for this too, but it does not work. I am unable to get the car to park parallel unless it is almost in the middle of the street and it will only reverse park sometimes, and only if there is one space between two others. Even then you can drive around the same area three times before the car will tell you there is a vacant spot. You cannot select the spot where you want to park, it is only if the car finds the space, and that can be a long way away from where you want to park. 

This issue also happened while their mechanic was driving. They then told me he was only a first year mechanic, so he did not know how to park the car, and then told me that it was okay that the car will only park sometimes but not always. 

I have repeatedly had my car back with complaints for the gears not changing and sticking at between 2500 and 3000 rpm, both before the transmission was replaced and all of the following issues still continue. 

Can you advise me what is best to do about this, as the latest information I have just received last week is that Chrysler Australia cannot fix my car and they have contacted Chrysler USA for assistance? Their foreman told me about three months ago not to complain to anyone i.e. Consumer Affairs because Chrysler would not help me. But they are not helping me now, so I am not sure what is best to do and see you have experience with these issues and hope you can advise me what to do.