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The iPhone 6 Plus has very limited stock, stores are getting stock as quickly as they can, no doubt if they have you on a waiting list in the store they will let you know when they have a handset in stock for you. It isn't a personal. Even if you attempted to order the device outright directly from apple it has estimated time frame of 3-4 weeks.
Previously worked with a Telstra Partner however I am not a Telstra Employee, just a fellow customer helping when I can.