Just a thought. Try putting the plant and pot in a plastic bag to keep the humidity high for a couple of weeks or so and make sure it stands in about a half inch of rainwater at all times. However, remove the bag before 2 weeks are up if you see any sign of mould developing inside.
D. capensis will naturally die back in the winter especially when cold, so has yours been exposed to cold conditions after repotting? Do not give up on it even if it loses all its leaves as after a winter cold spell, it will usually regrow from the base of the the plant or the roots so long as it has not bee