I work for a local police station in the complaint room, RUN AWAY.
Publishers PAY you after they publish the book. You NEVER pay them.
It is an identity thief scam. If you have given them your social security number PUT A FRAUD ALERT IMMEDIATELY on your ss number. If you have given them money ask for it back claiming you have changed your mind. If they do not give you back your money within a week, take all the paperwork you have including communication and go to your local precinct. You are a victim of a grand larceny scam.
Just remember "What sounds too good to be true, usually is." Especially when your hard earned money is involved.
IMHO,
Kate