There is a very good chance that your
plant did not need to be transplanted. I say this because unnecessary repotting is the single most common reason for
plant problems and everyone likes to do it. Potted
plants do best when quite potbound and when their roots sre left undisturbed.
I suggest that you unpot your
plant, remove the soil that you added when you transplanted and put the
plant back into its original pot. While it is out of the pot you might inspect the roots for signs of rot (soft and mushy) or excessive dryness (dry soil and shriveled roots).
It is also important to get an ID for your
plant so you will know what light it should receive and how dry the soil should get in between waterings.