MERCEDES BENZ

Question

MY C180 BENZ, MY ACCELERATOR PADDLE HAS MALFUNCTION,WHEN I START THE ENGINE,PUT I FEET ON THE ACCELATOR PADDLE SOMETHING IS HAPPENING IN TERMS OF MOVEMENT, THE CAR IS MOVING ON ITS ON, ADRINE, NO CHANGE OF SOUND AND ITS MOVING SLOWING LESS THAN 0.5KM OR LESS, I CANT SPEED MY CAR USING THE ACCELERATOR PADDLE?
KINDLY HELP