Hi I have an accident with other party fault now after other part have completed the vehicle inspection they are saying our vehicle was involve in accident before but we know for 100% sure our vehicle was never involve in accedent before now how can I proof to insurance that our vehicle was never involve in accident before.

You can go to a car dealer or your insurance company should be able to run VINGuard. This is a program that would show if a car has been in any accident by entering the vehicle identification number and prints it out.