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I got in an accident in my 2003 chevy trailblazer they valued it at $8700.00 with damages at 5600.00 they claimed it a total loss. they offered me 8721.00 I said it was too low and my car was is great condition so the looked at pictures online and adjusted the value to 10,041.00 and the damages went up when they tore the car down and damages are now 7300.00 and they want to fix the car even though the damage percentage is higher. how can they do that? are there any parts that they have to use OEM parts? and not after market?