Hello, sorry to hear you are having problems.
What plant are we having trouble with?
When did the plant start to dry up, before or after the transplant?
Is the plant still in the small terrarium, and is this one of the cup terrariums: a clear pastic drinking cup turned upside down to cover the plant and pot?
What lighting conditions do you have for the plant? If the clear dome, a.k.a. plastic cup, is still on the pot and the plant is placed into direct sunlight, the heat buildup in the dome will bake the plant.
What type of water is being used to water the plant? Distilled, Rain, or Reverse Osmosis water is the best. Using city water, or even well water, can be death to a carnivorous plant. Also make sure there are no fertilizers in the new soil mix and in the water supply.