[Resolved]  Honda City Car — harrasment by dealer and company

My car was giving noise from engine. Dealer says it is because car was driven in rain on flooded roads. There is no visible mark of water entering enigine from anywhere and even interiors of car are not having any sign that it was driven through deep waters. Insurance company says it is not because of water entering engine. Car is under warranty. Both are denying and not agreeable to each other. Pls guide me how to proceed.