Hyundai Motor India — delivery of car

Address:

Saharanpur, Uttar Pradesh, 247001

I had booked i20 era red colour on 9-mar-2018. They had promised us to give car on 11-mar-2018. But when we ask now about it, they said that it is not available on stock and said to take car after 5 days. But it is very urgent to take car on 12-mar-18. We had complained about it on customer care on 9-mar-18, but they are not giving any response. What i do now...