Ignition Module problems of the 2015 Chevrolet Silverado

After sitting for two days, I went out to start my 2015 Chevrolet Silverado to drive to town and it was dead - no power, lights, horn, ignition, nothing. The vehicle was absolutely stone cold dead. Having two decades in the car restoration business, I grabbed my battery charger and hooked it up and charged the battery for 4 hours. Attempting to start the Silverado again resulted in the same thing - stone cold dead. I swapped the batteries to no avail. The vehicle still wasn't powering up. I looked for blown fuses, loose connectors, all with negative results. I had the truck towed to the dealer 106 miles away. The next day the dealer advised it started right up after a jump start. My reply was that is simply incorrect and I repeated the steps I went through. They replied they wished to keep it for a few days. Ultimately I had to trade the vehicle because the dealership stated the truck wasn't designed to operate in a dusty environment. My reply was that I bought it to use on my ranch and they knew that to begin with. They advised the dust permeated the body control module, engine control module, and human interface and today's trucks simply are designed for that.