Can car insurance company change their decision a week later?

Question Details: My son was involved in a minor car accident last week. We have only third party liability insurance for the car. Nobody was charge and my son have a witness proving he is not at fault. After few days of investigation, I received a message from the insurance company that my son was not an fault. That they covering the repair of the car. And they gave him a rental car to drive. Now, a week later, they are changing that decision saying they make a mistake.

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