Comprehensive insurance (non faulty)

I have comprehensive insurance and recently I got into an accident where I was rear ended. My rear fender has deep scratches with slight scratches on my bumper. My insurance did a survey on my car today and told me you can either take the cash loss settlement of 700 or take it to our garage for repair. I feel like it’s too little and they are not pushing for replacing the fender. I need your advice on what to do.

Fyi, the car is a y62 Patrol nismo.