Windscreen replacement - gone wrong

National Windscreens replaced my screen and supposedly recalibrated the cameras. Car came back in a state (see pics). 

Broken glass left throughout cab and across leather seats, broken plastic clips found (presumably from the camera surround as it’s not been put back together properly), gap in N/S corner of screen where seals don’t line up, and a white polystyrene bobble on the inside of the glass - in line-of-sight of one of the cameras. 

Told insurers, passed back to National Windscreens where a regional manager tried saying the gap in screen was supposed to be there to allow water through - until I mentioned I had before and after photos... 

It has to go back for a second replacement to “give them chance to rectify it” but I really have no confidence in them. Total lack of care.

1) Can anyone tell what the plastic clips might be from? (I’ll try and get better pics).

2) If it comes back a mess a second time what are my options? Could I take it to ford to have it done properly and then try and claim the money back? Or request a different company such as Autoglass?