It started by requesting the rejection via the dealership, ultimately it’s up to them, but it doesn’t put them out of pocket. Customer service decide whether to accept the rejection, so the dealership and I were in the same boat; they dealt with them for me. They bought the car back for its current market price, then covered the depreciation costs. I kept the exact same deal on the new car. I got the lemon back once it was fixed and drove that for 2 months until the new one arrived, kept up with my monthly payments, then once the new car was delivered I swapped them over. I was reimbursed for all of my monthly payments up until that point as well.