I've received a letter from a law office asking for my auto insurance information. It states that this law firm was retained to prosecute a claim against me "for property damage arising out of an automobile accident that occurred on 09/xx/13". It looks like they either got my car info by mistake or this is some sort of scam, because I was was not involved in any accident of any kind. There are no signs of any contact or damage on my 6 month old car either. How should I react to this?