I would not be surprised that they installed the part since you did ask them to order it. Not like they were going to order and store it until you decided. I kind of get your point but I personally would just be happy the car was back in operation for that amount, which sounds kind of minimal. Before we got rid of our Toyota Avalon we probably spent that much on getting the AC issue repaired. That was a nightmare as it took countless trips from local shop and dealership service center to fix and it probably ran about the same as your repair. 175,000 miles and a 2001. Up until that point we only had regular car maintenace needed. If there was a history of that part failing I could see a case for recall/goodwill but otherwise just the luck of the draw on what I assume has been a good car to own. BTW you posted before I submitted my post so not meaning to rehash the order part. I'm just surprised I guess that you'd want them to remove the part and give it back to you the way it was. Sometimes decisions don't go in one's favor and while it can be satisfying to fight something like this I suppose I wonder if it's more about getting something for free. I've never heard of a dealership service center (yes I know Tesla doesn't have dealerships) ever installing a pulled salvage/used part for using in a repair they are doing.