Seller is not ready for registration.

I was shortlisted a plot and with property builders, who is having a JD with property owner. Finally I signed a sale agreement of 72lakhs. Initially I asked what amount will be shown in real documents he said same amount as sale agreement. Hence I paid 10lakhs via cheque. And started bank process, I have my wife pregnancy hence I delayed 1 month which I said to that property builders. Then after I tried to due process they said owner went to Dubai and it’s will take 1 month I waited for that as well. It’s been 3 month. But agreement was only for 2 months. Now I asking continuously to do registration. That builders are avoiding me and saying owner want some black money. But as I don’t have liquid money I already applied loan for remaining amount. Now my loan is going to lapse. Now they are not ready to give me any compensation and I spent almost 1 lakhs for documentation charges for loan. And intentionally they are delayed to give the advance amount of 10 lakhs still discussing with them.