Dear Sir, if you have proof for payment of advance amount to the said broker like sale agreement/mou/cheque/payment through online bank transactions any one, you should issue legal notice through Lawyer to the broker as well as give police complaint against him and also file recovery of money suit before jurisdictional civil court. All the best.
If you have evidence then approach police and Civil Court.
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Disclaimer : This answer is based on information given by you hence, It is just opinion of Lawyer. For specific answer you have to give details and facts and choose the Lawyer of your choice.