Hyundai Motor India — extra amount charged by dealer after booking of car

Address:

"DEV NIVAS", FIRST FLOOR,, BEHIND JANKALYAN, NEAR RAILWAY CROSSING,, BELOW NATHALAL ZAGADIA FLY OVER BRDIGE, BESIDES VRAJDEEP FLATS, L.G.ROAD, MANINAGAR, AHMEDABAD, GUJARAT,, Ahmedabad, Gujarat, 380008

I had booked hyundai venue on 27.12.2019. By paying advance of rs.11000 for price protection of 2020. And on jan 15 2020 i paid full payment. Now on february 08. Dealer has asked for 23000 difference extra for supplying bs vi (6) model. I had booked for bs (4) model now they are supplying bs 6 model with extra charge. So what to do as at time of booking i was not informed about this extra charge.