Broker sold me a piece of land at higher price what action can I take

I bought a piece of land from a broker on a trust basis. The cost incurred was 23 lacs rupees. I was so naïve that I didn’t even bother to scrutinize the details back then. Now, when I’m all out to sell this property, I got to know that this is a kind of fraud case. The actual cost of this land at the time of purchase was merely 8 lacs rupees, neither government rate nor private agency rate match up to the cost incurred. Also, when I visited Patwari, he is kind of misbehaving and trying to get some money. He is measuring that piece of land again and again and marking