Hyundai / Santro Car — manufacturing defect

dear sir,
this is vijay kumar of A.P have been driving santro since May 2006.As this was my first car, my knowledge reg maneuvering is novice then.when ever i used to drive my friends santro i felt the steering was light and easier to rotate than my car.this was brought to the notice of a hyundai serviceman in kusalav hyundai, VIJAYAWADA, A.P. The reply was every thing was normal, as this was a new vehicle you were feeling like this.After few more months again I observed some sound.Then they replaced the AC coil and said the problem would not repeat again. I was satisfied with this answer, for two years, when i was on a drive to HYDERABAD on July 2008 i heard some click...click... some abnormal sounds from my car.The very next morning i visited KUN UNITED, a HYUNDAI dealer in HYDERABAD, the service personnel said' the car was o.k there was no sounds'.Really there were no sounds.From then onwards the problem was recurring now and then.i was unable to diagnose the correct problem.Few months back the sound was magnified. The service personnel in HYDERABAD said there was a manufacturing defect in the steering, the oil was leaking slightly and the entire steering suspension has to be changed which would cost around Rs20000. He also mentioned as it was was the third year the customer has to bear the total amount.Now the carper under the driver floor mat is fully wet with oil and became very ugly to step in to the car.
My question is to a problem that occurred at the mfg. itself, why i have to suffer like this?
As i am unaware of the exact problem that happened like this.But i am regularly servicing the vehicle at the company outlets only ..At least they should have noticed this.every time they said ok, and finally when it magnified the problem came out.

please do the needful in this regard


with regards
vijay kumar