Sadly, this unscrupulous behaviour happens almost every day. Your opponent appears to be quite savvy and possibly not without a history of these events. It�s an unfortunate fact that insurers roles are not always there to �help� you. Their role is in their accountability to shareholders and when they have reason to deny a claim, they take advantage of that opportunity.
You �could� take the person to small claims court. Strangely enough, based upon what you�ve shared, there�s a scintilla of a chance that you could succeed. But it depends on how adept the judge is in asking the right questions, such as: why would the plaintiff provide such an accurate description if this isn�t really what happened.
I suspect, your now alleged victim, is banking that you are stumped, don�t know what to do, and will just chalk it up to a bad experience. Depending on how motivated you are, you do have a �chance,� albeit a small one. It might be interesting to determine whether this individual has been involved in any other �experiences� such as this.
I feel badly for you. I can easily envisage the scenario.
I wish you well
Fr Bill