Godrej Properties — After purchase of the flat I am being told that the the price has gone up by 3 lakhs

Address: Pune

I visited Godrej properties Forest Grove site on 1st September 2020 and booked a flat Tower A4- Unit No 1503 in the subvention scheme of 10: 15: 75. I paid the token amount of INR 50000 and also gave a cheque of INR 480149 both the cheques were realized. On 13th October I requested the sales person Mr. Pankaj to let me know the amount for registration and on 14th October 2020 I received a shock that the price of my flat has now gone up from INR 5705186 to INR 6030000 for no reason. I reasoned with them and with his senior Mr. Prakash but both refused and said the prices have gone up we can't do anything. I have now been told take back ur money or pay extra for the flat. I booked this flat as it is a Godrej properties and now I am being cheated .