Christy Broome-Hunt

I have a 2007 Chev Silverado new body style it was towed and for an unknown reason the tow company made a key for it. It ran fine and after they kept trying the key it will not start or crank. If I leave the battery in over night it drains the battery. I have no ding when the door is open and key in the ignition, no dome light, no dash power, no interior power until the key is in run mode and after a few seconds the dash power will come on. I send it to the dealer and after six months they said it was the fuse block under the hood. Replaced both fuse blocks and it did not help at all. Anyone have any ideas?