20 January 2020
First of all check whether the broker is registered with RERA or not. You can demand the copy of his registration and can cross-check it on the site of RERA of your State. If he is registered then he cannot demand more than the prescribed percentage by RERA. If he is not registered then make his complaint with the RERA.
28 January 2020
There is no provision in law to fix the brokerage or commission to brokers. If the broker is demanding an exorbitant amount towards commission, you can refuse to accept the deal itself, he cannot legally demand for any damages if you do not accept or agree to the currently negotiated deal. It depends on the circumstances prevailing at your end and not on the basis of any legal provisions.