Very unhappy with service from Dotsure & Netstar

I was very happy with Dotsure until I changed my vehicle. Recently a Netstar unit was fitted to my vehicle. During the fitment a clip that holds my headlamp in place was broken. Netstar did an assessment and mentioned this vehicle was involved in an accident hence the clip being broken. Prior to taking delivery of this vehicle I checked every detail along with the salesman. I personally washed my vehicle the day before the fitment and this clip was not broken. Why is Netstar beating around the bush and trying to pass the buck. Please take responsibility for damaging my vehicle. It is ridiculous to insinuate the vehicle was involved in an accident. Do you seriously think the dealership would just sell me an accident damaged vehicle straight off the showroom floor without sorting all the issues? Dotsure is contracted to Netstar but they are avoiding my calls and not resolving the issue. Please I need this matter sorted urgently!!! My policy number is OAK***. Please call me on *** to discuss this matter & resolve it. I want Netstar to replace what they damaged & stop beating around the bush.