SHOCKING service Nissan SA and McCarthy Nissan Randburg

The absolute worst Nissan SA experience ever. My X-Trail has been returned to Nissan Randburg FOUR times to investigate a knocking sound. Each time I return the vehicle I am without a vehicle for a few days. This latest time, I have been without my car for more than a month! It has now finally been determined that the vehicle needs a new engine and warranty approval from the insurer is being awaited. I receive absolutely NO FEEDBACK from anyone on the status unless I call and request information! Numerous promises of a loan vehicle have NOT been forthcoming. I've now been told that Nissan SA has approved a rental vehicle but that my excess will be R10300.00 should anything happen to it. This is unacceptable! I have been severely inconvenienced not having my own car, costly ubers etc., relying on others for lifts. My own car insurance excess is R3000.00 - why should I now be at risk for R10300.00?? I have a family holiday booked in December and I don't have a vehicle suitable to use for the holiday. I have sent numerous emails to Customer Care - had numerous phone calls with them - NOBODY will help!! Nondi, the Supervisor is NEVER available. She promises to return calls - this NEVER happens. She's either on training - or loadshedding - or knocked off early because it's Friday??? The Manager, Monica will not take any calls, and the call centre customer care consultants will not give me any phone numbers or email addresses of senior people. So, for going on 5 weeks (this after 4 months of struggles), I still do not know: - when I will get my own car back, - whether the new engine will be covered by warranty - which is a whole new issue - or -whether Nissan will have the decency to give me a courtesy vehicle, or a rental vehicle on the same terms as my own personal insurance. I feel so helpless - I really do not know who to turn to anymore. The customer care consultants are all friendly and really try to assist, but they are also stonewalled by their seniors!