03 megane back windows not working?

have 03 megane in july 09 got out of the car i day pressed the remote key to lock the car and the rear passanger window went down then in jan 10 the same thing happened to the rear driver window, there is no noise from the motor when you press the buttons, spoke to renault said about 700 euro to fix needed motor and regulator replaced is this the case or could there be a fault elsewhere