Hyundai i10 — warenty issue

dear sir
i have purchased hyundai i10 magna, my car some problam in ecm systeam ,its diagnosed by concept motor in ahmedabad, allthough says never problam in ecm systeam ,my car warenty in period, but some mechanical work has been done out side, so they are teling me ur warenty is not eligibale,but i have not any electriocal systeam work at out side, at till date, only body work done that time,so plz do need full ,
my car
GUJ 3 -CE - 779 I HAVE GIVEN MY CAR AT CONCEPT MOTORS AHMEDABAD SHAREKHJ HIGY WAY FOR THIS REPARING PERPOUSE, DATE 10/10/2009 DURING WARENTY PERIOD,
AM I NOT ELIGBALE FOR WARENTY ???????????
KINDLY CONVEY MY COMPLAINT TO PROPER PERSON & DO NEED FULL ,