Nissan mistake = NO RESPONSIBILITY

I am disgusted with Nissan SA who have acted in an extremely unprofessional manner. My issue started when I purchased gear box oil for my Navara from Mark White branch. I provided them with the VIN number etc to ensure that I was purchasing the correct item for my car. I thereafter started to have trouble with the gearbox and while purchasing another product from the Edwin Swales branch - imagine my surprise when I am told that I require a DIFFERENT oil than the one provided to me by the Mark White branch. I was thus informed by the Edwin Swales branch that I have been sold the INCORRECT product for my vehicle!! I am floored that a big corporation can be so *********** as to provide me with the wrong product despite being given the VIN number! To make matters even worse, I contacted Nissan SA via FB to inform them of the issue, only to be given NO RESOLUTION! As more troubles have developed with my gearbox over time, I followed up with them, only to be made to jump through hoops and provide proof of purchase, bank statements etc and then have them turnaround and say that I waited TOO LONG TO REPORT IT!! How ridiculous the service has been from Nissan. It is appalling that a mistake is made BY NISSAN and then they DO NOT TAKE RESPONSIBILITY for it. It is DISGUSTING that Nissan can act as if the customer must know which product is required for their vehicle...that is the WHOLE POINT of going to Nissan directly and paying the price!!!