Poor service from Nissan sinovile and Nissan SA

Took Nissan Go for 90 000km service, they called us and told us the car has a gearbox leak problems.. It's 3 weeks now and we are stil waiting and we are loosing money in the process, always I have to call so that they can give me update.. They really don't care about their clients as long as they are receiving money from servicing other vehicles.. These has caused lot of stress to my partner health and wellbeing..ive also opened a case with Nissan SA but they are not pushing. We realy regret buying Nissan brand, we Wil never buy anything or advice anyone to buy Nissan brands.