Green Thumbs Down

Recently I repotted a few house plants that seemed to need new soil added to their pots. I have repotted plants before and they grew bigger and remained healthy. Well, I managed to kill 3 of the 4 plants in 2 days after repotting them. I have no clue what I did to them, I took them out of the pot, added new soil, put them back in and gave them a little water with food!! 1 day later 3 of the 4 plants shirveled up and wilted all the leaves away!! I have even kept them in their pots thinking for whatever reason they will grown back!! They were really pretty plants too, I myself was amazed at how well they were growing the last couple of years. So I bid my plants farewell, I hope you all revive yourself and come back soon, although to my dismay I am sure you are gone forever:(