Nissan is the worst

I bought a Datsun GO T car from NISSAN showroom in Sector-3 Noida.

At the time of booking they provided a breakup of total amount in the booking form. So I paid what they asked.

But When I received all the documents and bills, I found a huge difference in total amount.
It was a Rs. 26000 difference in ex-showroom price, Rs. 1299 in RTO/Registration charges, Rs. 7550 in insurance, which sums up to Rs. 34849.

When I asked to refund the extra amount paid, they simply refused. They told me that they charged what they told me earlier. When I asked to provide the bills, they failed to provide the same.

It is clearly a fraud, I am not asking for a discount but asking for bills for whatever I paid. So, It is clearly a cheating.

Another thing is delay in RC, I booked the car on 22 Aug 2016 and after loan approval and other formalities I finally got the car delivery on 27 Aug 2016 and paid the remaining amount on the same day. I have receipts of whatever I paid. They provided the RC on 19 Oct 2016, in almost 2 months, I was promised and assured that the Registration Certificate(RC) of the car would be provided to me within 15 days.