Jamz3k

Long story short at a public carpark close to me they have obscenely sized speed humps that have damged the bottom of my car. I heard the scrape etc but didn't think much of it until last week when it was raining heavily and my drivers side floor is soaking.

After getting my car inspected, they suspect that it is damage to the bottom of my car that has caused the leak? were do i stand and how to i prove this?