Horrible Service

The sunroof of my car got torn while I was closing it. I was told by Discovery to go and get the car assessed to establish the extent of the damage, I did (twice). I was told to go for a further assessment at VW to determine if it was accidental damage or wear and tear. I've been to VW at least four times and today they pointed out that they will not be able to determine what caused the damage. Somehow Discovery still insist that VW must go back, even though I'm contracted to Discovery not VW, It would appear that Discovery would want nothing more than VW to say the damage was due to wear and tear, and they are not prepared to accept that it could either accidental or VW really cannot tell what caused the damage.