Hyundai Motor India — Spare replace issue

I have put additional warranty for New Santro car spares. My remote key is not working properly. I visited showroom for claim warranty. Sales person said that we will order new key and let you know once received. But 4 months gone there is no response. I called many times he said it's in processing.. Now he is saying I'm not responsible company didn't send what can I do? said like this.
My car Number is: TN 38 CR 8215
Name: Chandrasekaran
Phone: [protected]
Email: [protected]@gmail.com
Date: 30.01.2023
Service center Location: Lotus Hyundai, Ganapathy, Coimbatore - 641006.