damp repair

Hi,

As anyone had a damp problem successfully fixed , if so can you tell me whats involved. This is our second van with damp the first had to keep going back to sort it out as it was never fix right in the first place.Ended up getting rid. when we found damp in the second van we could have cryed. We don't want to be fobbed off again by dealer and want it to be sorted. We found damp near window, and in wardrobe near rail 70%.

Thanks