Procedure for refund of booking amount and broker commission

sold property in gurgaon ,buyer credited 10 % token money in our account.Failed to arrange rest of money and terminated the contract himself and demanding full refund.with his token money we also booked a flat from his token money for which builder is charging us 10% interest.Now the broker is threatning us ,that he will not allow us to sell iit to some one elase ,alsoasking 1.5% broking amount but at the time of deal 1% was fixed,