This actually happened to my daughter on Plenty of Fish. Luckily, it never went anywhere, because she showed the guy's picture to a friend of hers. The friend said, that is not XYZ...I know that guy in the picture, and his name is not XYZ. Plus, he is happily married, with a daughter, and lives in another state.
She talked on the phone to the Catfish a couple of times, and he still tried to get her to go out with him. She basically told him to get lost.