can be any of the following...
clutch system oil leak,
clutch master cylinder seal burst.. in which case you can either change the seals if the cylinder is good.ie no pitting or roughness inside.. seals will cost MAX 300 to 400... its a small rubber washer type thing.
or you can buy complete kit pistons and seals locks etc for i think 1k..
or completely new master clutch cylinder for between 2k and 3k... at least that was the price quoted to me by shopkeepers when i went asking for the rates of any japanese clutch cylinder..
first however you must check for leaks.. then top up clutch oil and then do air bleeding.. if your car is in warranty then give the IMC people hell..
this is not exactly a difficult job and not much different than brake fluid bleeding.
if there is no oil leak.. and clutch feels firm and not soft than could be problem in gearbox throw out bearing ... but somehow i dont think that can even happen..
dont go to a monkey mechanic. when bleeding.. pump the pedal gently.. not forcefully.