Where to repair Samsung NX300 18-55mm lens.

Unlucky drop of camera bag has resulted in 2 piece camera.
Camera lens broken off at the bayonet connection. With the result that bayonet is still attached in lens socket and lens+electronics is broken off.

I don't believe the warranty covers a broken off lens.

Where in Bangkok can one get Samsung lenses repaired?  All tips are welcome.

I'm also interested if there is a second hand shop/place that sells Samsung NX Lenses.

// TomYam