You are correct. Someone is looking to blame anyone else for their problem. Connecting the cables backward would have instantly blown a lot of fuses. There is no way possible they could have driven the vehicle for a few feet, let alone days or weeks. Even if forced to engage, the starter motor would have run backward. Its over-running clutch wouldn't even have spun the engine.
If your customer doesn't believe you, have them post the problem here, and include all the details and chain of events.
Wednesday, February 17th, 2016 AT 8:30 AM