Did you get an order confirmation code? If so use that when you contact DR. If that does not work and/or DR refuses to provide the information, contact your CC company and put a stop on that charge stating the product ordered was not delivered and after contacting the company they were of some/little/no help.
At the least you will recoup your money. Outside of that I recommend Amazon or Game Stop or Best Buy or what ever local video game store/site is available to purchase your code.