Tell them that the camera was working when it was dropped off, and then not working when picked up. It's called 'duty of care', and they owe it to you to take reasonable care of your goods whilst in their charge, and to carry out work competently. They appear to have failed to do so.
I suggest you inform them of this, and if they still refuse, tell them that you will book the car in with another BMW dealership for rectification work to be carried out, pay the bill, and then take them to court for the bill to be paid in full.
Most likely, it's a blown fuse, trapped wire, or dislodged connector.
As to their insistence that the Parrot kit doesn't go near the wiring, and bearing in mind that the car battery is in the boot (and the camera wiring goes from boot to dash, and Parrot wiring therefore does the same, unless they've 'tapped in' along the line, then it is not entirely seperate. In addition, the Parrot (like the camera system) uses the car speakers, I assume. So, again, the two systems are intertwined.
I'm a bit mystified, however. These all came with the standard bluetooth - it was just the 'Enhanced Bluetooth' which was an option (wich allows texts to appear on the screen).
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