just start looking for another job, unless you signed and your employer signed a confidentality notice before answering these questions, no i am sorry i don't think there's anything you can do.
a rule of thumb i always live by in the work place, regardless what they say, what you tell them CAN and probably WILL come back to haunt you. even when on paper, be careful what you say and always try to find something positive to say, even if it's "i like how she fix's her hair, what she wears" and say nothing about working habits, if you can't find anything to say nicely, etc
employer's will do what they can to save them money including lying if they can, there's ALWAYS a loop hole, and they hire people with legal experience for a reason