Are you sure Mendota is an insurance company? (Is it possibly an insurance agency and not an insurance company?)
I suggest that you contact a Missouri attorney as soon as possible and see whether or not you still have a viable claim, given the length of time since the happening of this collision. You need to find out what the statute of limitations is in Missouri for bringing a tort claim such as the one you propose. Do not delay in seeking counsel.
Mr. Lundeen is licensed to practice law in Florida and Vermont. The response herein is not legal advice and does not create an attorney/client relationship. The response is in the form of legal education and is intended to provide general information about the matter within the question. Oftentimes the question does not include significant and important facts and timelines that, if known, could significantly change the reply and make it unsuitable. Mr. Lundeen strongly advises the questioner to confer with an attorney in your state in order to insure proper advice is received.