怎麽和保險公司negotiate理賠數額? 請保留一會兒!多謝!!

My car is involved with an accident. The insurance company appraised the car and told me the car is total loss. The value they gave me is much less than what I got from the dealer where I bought the car. Really need some advices/tips on how to negotiate with the insurance comany on the value of the car.

Many thanks in advance.