Need advise if I should get a lawyer or not, my car is totaled.

My car was rear ended. This first accident, my car has minor bumper damaged. It is all covered by the 1st car ins co. The ins trusted auto body shop fixed it fine. But the shop parked the car on the side street next to their property. 2nd accident happen. I wasn''t there and I only hear this story from the shop owner. The driver who initially at fault, doesn''t have ins, the auto body shop claim the damage of my car through their ins as the car was still on their possession. Now the ins co adjuster deemed my car total loss as the repairs cost more than 70% of the value of the car according to them. I will be given a check and 10 days car rental. I checked in KBB, the value they appraised are not that much different. But now I''m at the inconvenience to get a new car soon, with all the time taking off from work and that I''m at loss for the value of my car since I just got the car over 2 months ago 10k above the check I will receive. What are my options?