Transmission Not Go Into Gear problems of the 2001 Kia Motor Optima

Car hesitated once or twice upon acceleration, could not recreate problem. 1 week ago, while trying to pull out of the garage, car would not go into gear. When car finally went into gear car would not move unless accelerator pedal was pushed to the floor, and even then barely any movement. Took car to kia dealership, three days later dealership called, the transmission needs to be replaced. Dealership said it had to "fight" with the factory rep to have the transmission covered under the warranty, even though I provided proof of maintenance. Dealership ordered new transmission, when prepping car for the new transmission a "hole was found in the subframe", that is not covered under warranty and the transmission cannot be put in the car with the hole in the subframe at a cost of $1,800. 00. Dealership cannot explain how a garage kept 7 year old car has a hole in the subframe.