A dealership technician crashed my car in a test drive after the service was done. I still have payments on it, what I should do

The dealer was your "baliee" and was supposed to fix your car and return it to you fixed. Any reputable dealer in this situation would accept full responsibility for your damages, including further repairs (this accident implies that the service was not done correctly if their own technician did this) and body work and a comparable replacement care while your car is being fixed. I'm not sure what the towing has to do with anything.

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