Finishing still running, car economically irreperably defective – forced cancellation ??????

Hello dear forum, my Ford Mondeo, BJ 2004 is economically irreperable. The financing laft over the bank Deutsches KFZ – Gewerbe. I called today and described min Prob. Their reaction, I should trigger the car and only then I receive the letter, or I should pay an expert who created an expert report on the residual value. There would not be another possibility. They do not even want to give me the letter to unsubscribe the car. My idea is now to The car is no longer traffic safe after the moto, the clutch is over and the brakes are no longer working and to ask for a compulsory closure. I could put the car in my garage or in a shed on my property and then when I have the letter sell. Does anyone know if this works, or does someone have another IDEE ????