The first thing to ask your dealer is if they have allocation to order a Hellcat car at all. These are the allocation rules in a nut shell. Each dealer can only get one Hellcat equipped car per month maximum. It is likely that if they are not a big dealer, they will not get one every month. That car will either be a Challenger or a Charger, not both and the dealer has no choice as to which one they get. Then if the allocation is for a Challenger, that challenger may have a manual or an automatic transmission. The dealer does not have a choice as to which.
Now throw in the fact that you are trying to order a Plum Crazy color. That is a special order high impact color with , I believe, a three month order window. SEP, OCT, NOV. I am working from memory here so if I misspeak, someone please correct me.
I would go talk to your dealer and ask some direct questions. If you do not get direct answers, Start looking for a new dealer.
You should get a VON the instant your order is placed and your dealer will be able to print it for you while you wait. Also, a valid Hellcat order for 2016 will start with the letters HC followed by the numbers. As an example, my VON HC111890. The VIN comes later.