I agree that the charge sounds ludicrous, but the techs do have to get paid. Now, if they can't find anything and it still doesn't work they shouldn't charge you, especially if you can demonstrate the problem to them. If they find it and you have them repair it the charge should be consumed in the repair. In the US, I would guess the On-Star module since that's where the Bluetooth phone interface is located. I'm not sure which module it's in in the European Cruze.