Hyundai Motor India — not mentioning (bs 4) model in rc card or in invoice anywhere

I bought a hyundai car xcent sx 2016 model from port blair (Lms hyundai). The dealer only got it registered. He has not mentioned the bs 4 model anywhere let it be rc card or invoice. I have taken noc from rto port blair and want to get it registered in haryana state. Rto in haryana insists on bs4. They have refused to register it without getting it written on paper with authentication from hyundai. From hyundai side nobody is entertaining. I feet fully frustated and irritated with hyundai as have invested so much of hard earned money... What to do where to go???.