Builder is not refunding money

Dear Sir, I have allotted an one BHK unit in KRISHNA-AFFORDABLE HOUSING, Sector 14 sohna gurgaon,project of RAHEJA BUILDER. I have paid 6 lac to builder in an year but as I could not get home loan for this unit so I decided to cancel it on January 2016 .I have requested to builder to cancel and refund my money.as per raheja they will refund it after deduction of 25000 in 60-90 days. But now after 3yrs of cancellation this builder has not refunded my balance amount and making so many false commitments, after so many follow-ups on 13th September2017, they has given a written commitment of refund in 5 installments from December 2017 to April 2017,(instead of 25000 they has deducted 40000 rs) somehow after so much follow-ups they has given only 2 installments in dec2017 and in Jan 2017. Since Feb. 2017 again they are making false commitments but not giving balance payment. Here I am visiting every week there office for payment , as every time they are giving commitments of next week but giving cheque, now they are not giving time to meet and not picking phone also, it’s a humble request to you that please help me in this matter.