Sell agreement expire & need to exit from agreement

Dear sir/mam, I have a 2bhk flat.A Seller agrees to purchase in 18lac & do a agreement for 45 days. Gives me token money of 1 lac. There is no condition to deduct the money after the end of the agreement. Because I didn't get seller for a long time. But he got a loan of 13 lacs from the bank & he did not agree & the agreement expired after 45 days. Now he makes the agreement again for 30 days. Then the agreement mentions that 50% of the amount will be deducted if the agreement again expire without flat registration. Banks agreed to give a loan of 10 lakh rupees. But he did not agree. Since then he is not picking up the phone.Again the agreement date will be over on 8th November. What should I do?nnNow I get another customer who is agree to buy my flat. Am I do agreement with a new buyer after 8th NovemberHow to release from old buyer. Please suggest.