Hundyai santro xing eco -GL
Non endorsement of lpg

I booked a santro xing eco gl version from derik hundyai nagercoil, tamil nadu, south india and did get my vehicle on 29th december my car got registered on 7th January at marthandam r.t.o office . when i received my registration papers i noticed the the lpf endorsement has not been done though my vehicle is a lpg version even after complaint my requirement has not been done, kindly help