This happened to me with the first dealer I went to.
12th July - placed order with dealer
every week since - I called to see where it was at
15th August - received GMON number from dealer and called holden CS to get more info ans was told dealer submitted order to holden on 12th August.
Dealer had promised delivery mid september, Holden CS said mid to late October, called dealer and told them to give me my deposit back because they won't be able to deliver their end of the contract.
Got deposit back and went to another dealer that had one in stock.
The dealer I went through said the delay was because they can't just order 1 car, they have to bulk order them. I don't know how true this is, but waiting a whole month before submitting my order really pissed me off.