The dealer keeps changing the price.

at first, they texted me the promo downpayment was 45k.
Then it became 80k after a few clarifications, so i paid the 5k reservation. price seems reasonable.
I came back with all the documentations, i signed all the papers. Total downpayment price became 90k.
Few days later, Car was now shipping out from manila should arrive by tomorrow.
I asked them to email me the final quotation with undercoating it became 92k.
So I went to the bank and got the 92k Managers check.
Everything approved, all requirements/documentations met.
They called again because it's a quotation for a wrong car - the correct amount should be 112k.

WTF!!!

i want to back out from this deal now. can get my reservation back?
is there a proper way to get out of this deal?