Odometer Disabled - Hyundai Getz

Hi,
 
I just had my getz serviced and when I got it back I noticed my odometer is not working.  I have been told by some people that sometimes the Dealers disable the speedos so the mileage does not count up!
 
Does anybody know how I get the odometer working again?  Is there something to simply screw in or unscrew?  please help...

Thanks!