I used to order from them when they were known as Battle Hobbies. At the time, their selection was excellent, and prices pretty good. I ordered everything from kits to paints and thinners. Their service was always excellent. I would place an order (via telephone), and have it at my doorstep in about a week or 10 days.
Just my opinion, but I would give them a chance to come through for you. As I understand it, according to the Federal Trade Commission regulations, a company has to notify you if an item you ordered won't reach you within 30 days, and it sounds as if they have fulfilled that obligation. It could be that they are out of stock and have backordered your product. Since there are only four people who make up Roll Models, it is conceivable that there could be sickness, or some other acute plight that needed to be taken care of. I know that's not how to run a business, but I've seen it before.
Be patient.....
By the way, welcome to the FSM forum family!
Gip Winecoff