Buyer gave a token amount of 50000 and

Hello, We have a land for sale and Buyer approached us with token amount of 50,000/- and taken a copy of land documents for legal verification. We also exchanged agreements written in white paper document and signed stating that within 7 days buyer needs to do an agreement by paying 25% of land cost if not the token amount will be forfeited. If there are any issues found during legal verification we agreed to pay off token amount. Now Its been more than a month and buyer has not come back to us. Through property agen, we came to know that buyer is not willing to buy the land due to his internal problems. We are asking him to return the copies of documents and buyer is asking to pay the token amount back. He has not shown us any legal verification documents so that we can refund the money if there are any issues. Also we have noticed that he put the land for sale in few online property websites without informing us. Will there be any complications to these type of issues. What are the best ways to resolve this issue?