Nissan Car — poor commitment

Address:

Chennai, Tamil Nadu

I have booked nissan sunny petrol 2nd variant blue colour in the name of kuldeep kumar gupta on 21 jan 2013 for immediate payment no finance and i was assured by the sales exrcutive that i will get my vehicle by[protected] but they failed to do so, when i visited the showroom i was given another commitment that they will surely deliver the vehicle on or before 6th of feb,n 7th feb i was updated that no stock available and vehicle will be available only after 15-20 days, my question is when no stock is available why you took the booking?and now they are saying that the offer we had at the time of booking is not available at the time of delivery so we will not be able to give you the same offer, my quetion is when i have given the advance and blocked the vehicle then no point of offer changing or not? if the customer book the vehicle before offer and at the time of delivery if the offer assist will you refund the money?one of the reason i booked sunny was, short deliovery period.
Already 20 days wasted no response complaining customer care or to dealers, TODAY I HAVE GOT A CALL FROM DEALER THAT THE COMPANY HAS DENIED THE OFFER.
As a proof i have advance paid receipt,agreement copy -(discount clearly merntioned). i want you to help me, as it is clearly cheating and fraud done by nissan. showing attractive offer and getting the booking from customer and then delaying the vehicle and at the time of delivery saying that old offer is not valid.