Suevcats

I have 2015 edge titanium with soaked drivers mats. I called the dealer and was told that the fix was done. I had the HVac system drained but every time it rains I have the problem. I stopped taking it to the car wash a long time ago as I would have to use the wet vac to dry out the mats. The dealer left me feeling it was my problem. Can this even be fixed! It is a shame as I rust check the car yearly to protect it so that it can rust out from the inside