Hyundai — Part under warranty

Address: Burondi

We have serviced our car 2 but still the orange engine light is on
After making enquiry they said there is sensor problem and part need to change but after detail enquiry we came across that the said part is under warranty and same was not told to us by showroom executive which is vey shamefull
As a customer of Hyundai it's your responsibility to guide us in this regards
Details of our car is as mentioned below
Name -Samata powar
Car model - Certa 1.4 Crdie+
Showroom - Mai Hyundai Chiplun
Please consider it as urgent and revert the same