I have a friend that I trust in the car business who says when this happens usually the dealer doesn't have allocation from the manufacturer to add another truck order. They will tell you they do to get the sale, they will put you in their system, but it could be months before you actually get a firm order moving ahead with Ram because the dealer is waiting on allocation. When I ordered my Laramie in December I had a VIN the next day.
A friend of mine was pursuing an order from the local GMC dealer and someone he knows that works there told him off the record that he should look elsewhere, because he would be waiting extra long due to that dealer not having any available allocations.
Just a thought. I'd be willing to bet if you put another order in with the right dealer you would have a VIN very quickly, like most on here are saying you should.