Biana money paid but the loan is rejected how can i recover my money

I have recently paid bayana to the seller and i need a loan to buy that property. So in bayana agreement it was mentioned that if my loan is rejected due to issue in any document i will get bayana money back . So now there is a problem and one paper is missing , seller is not able to provide that paper and now only 1 week is remaining for last date of agreement . I am sure that the seller cannot provide me the letter as he is not picking up my phone calls and property dealer is not able to arrange a meeting between us. I have been asking him for more than 10 days but no meeting yet . Can you please guide me how i can make sure i get my bayana money back . What things i can do like SMS or calls so that if i have to go via legal way. Also the seller needed some money in cash and rest in registry . In bayana only registry amount is mentioned and i paid bayana via cheque so its also mentioned . Due to demonetization i will not be able to provide amount in cash only cheque.