Try telling them you will accept a cash sum in lieu of repairs , and will then repair the car yourself . No Cat C classification then
I was trying this route recently with the wife's ZR , which had been similarly damaged in similar circumstances , and they suddenly made us an offer we couldn't refuse so it went . It was collected by Copart and sold at their next auction as a Cat C for £125 . All it needed for a quick fix was a rear door .