Help !!! Kaputter fender cost 4200,- ???

I had an accident with my TT about a year ago. At that time I drove with step speed against a foreign car and pressed in the left front fender. The workshop had then repaired the vehicle. The invoice made Euro 4200,- from !!! Unfortunately my Kasko paid only 1200,-, since then the thing lies with court !!!!!!!!!!!! Now to my questions:1) It may be that by a pressed fender also the charge air cooler is damaged n can – was actually replaced during the repair ? 2) The bumper front was only slightly damaged at the edge – was also replaced and repainted – correct ? Since my TT was registered in Austria and also insured, the damage was inspected and regulated by an Austrian insurance company, but the car repaired in a German workshop . My big problem is that I do not know if the workshop has repaired too much – or the insurance just too little has paid ????????? in 2 weeks I have the trial – who can help me ?????