Parts delay

I am dissatisfied with the service received from Nissan EC Port Elizabeth. I ordered parts for a gearbox of a Nissan NV350 and was told the lead time would be 2-3 days. It has been a week now and everytime I call the salesman I am told he will follow up. I was told yesterday to call customer service and they told me the same they will follow up. They need to learn a thing or two from other dealerships when it comes to after sales and parts. Pull up your socks guys.