Parts numbers can't be found - Is this serious?

On February 20th I paid for 2 temperature sensors for my Nissan X-Trail 2008 at Datcentre Nissan Pietermaritzburg. <br> <br> It's now March 4th and they still haven't managed to get the right parts numbers in order to order the right parts. I keep on calling them and they always say they'll sort it out soon, and that they will call me in a few hours. They never call me, I always have to call them back. All they can say their factory in Pretoria is working on it but day after day I keep calling them and nothing happens. <br> <br> I wonder if this is going to be resolved but I'm starting to doubt it . My car won't work properly until these parts are replaced. So frustrating? One would have imagined that a car make that has been around for so long would be a lot more organised.