Booking amount Refund - No BBA signed yet

I am a resident of Delhi, I had a plan to buy a flat and I considered Winter Hills, Umang realtech Dwarka more New Delhi 110059. RERA No. DLRERA2018P000100. Where I paid a sum of rs. 4 lac as booking amount. Then later builder advised me that I’ll have to pay 10% of total amount to get BBA (total value was 1 crore.) Then I paid him totol of rs. 19 lac. Now, when I got the BBA I found that it was mentioned only one parking where it was agreed for 2 parkings and CARPET area was also very less. Then I asked them to make correction on the agreed points and mention the below 2 parkings super built up area. built area and caprpet area. in BBA. After some delay they came back with another BBA. Where they changed the format of BBA And made that a lease agreement instead of BUY-SELL. and completly denied to mention the area as per asked classification. Then I insisted them to revise the BBA and they disagreed. So I asked them that I want to cancel the booking, where he said that you can go ahead and within 3 days you will get refund. Now its been almost a month where I am only getting execuses like comapny doesnt have cash and making me take round n round on weekly basis. Can I have some guidance in terms of moving into right direction and get my money