2002 Chrysler Sebring Wiper/washer fluid

I have a 2002 model chrysler sebring with 109K kilometers. When I turn on my engine the wiper blades does not stop. When I turn off the engine wiper stops. There is another problem the control switch although in the off position doesn't control anymore the wiper motor and fluid washer infront of the windshield contineously spraying liquid until the engine is off. This problem occurs after I've had a battery and belt service from the dealer. Can you please help me to figure out what is the cause of these trouble? Thank you and regards.