Poor Service: Delivery of Windscreen - Useless!!!

I ordered a Windscreen from Nissan at the beginning on November for my Nissan Qashqai, through a glass fitting agent. I was informed it would take 3 weeks to receive the windscreen as it needed to be ordered from Japan. I waited for them to run their normal processes, and fast forward to date the windscreen has not been delivered despite having been informed that it is in SA now! Nissan JHB (Morgan Nissan Northcliff), as a gentleman named Lucas has been giving us a run ariund, avoiding our calls in the process. Lucas informed the agents that despite the windscreen being available in SA from 13 Dec already, it would only be couriered to Cape Town on Monday, 20 Dec which is utterly disgustung and unacceptable. I have an urgent trip to EC now, and this windscreen is wasting my time and energy! Can Nissan please send this windscreen today, 17 Dec on URGENT BASIS!??? I am really disgusted by this poor service!!!