Hitachi C21-F200 remote control

Have a look of my blog how to repair remote controls.
You do need some basic understanding of electronics or this could be a good and safe way to learn as there are no dangerous voltages inside a remote control.
http://www.instructables.com/id/Repair-your-remote-controls/

There are a lot of local service centers in the city, I don't know where you can find it exactly, why don't you check the yellow pages? The remote problem is not one that would cost a lot and you don't need to go the authorised Hitachi Service.