NP 300 Gearbox Continiously giving problems fixed 5 times by Nissan

I bought a Nissan NP 300 in September 2018 since its purchase i had to have the gearbox fixed 5 times and everytime it wasn't fixed the last time Nissan told me they will give me a re conned gearbox new but with secondhand parts i don't want a new fixed secondhand bakkie this was new at the time of purchase i'm going to have the contract voided by die bank as Nissan was unable to fix the gearbox 5 times and everytime there is a different story