Hyundai Motor India — About clauche kit fault

I bought a i20 Vista in it didn't run much just 37000 in past 5 years but it's been 3and half years I have been facing the problem that the clauche becomes hard and can't be pressed after every 40 - 50 kilometers and the car becomes slower over time and stops. Every time I go to the show room they change the whole kit and it costs approximately 15000 . But, it starts again after 5000 kilometers running. I have changed it 4 times in these years with this small running kilometers. I'm facing problem due to this fault and I can't trust on my own car that it will help me at my emergency situation.
I believe that you are understanding my problem looking forward to hearing back from you.. Thank you.