Procedure to claim damages from Govt

A state run bus rams into the boundary of the house. Boundary and the gate reduced to ruins. Filed an fir , bus got removed and came to know that it was because of brake failure. Bus is still in the possession of police. When contacted the transport minister, he denied giving any monetary help saying that because of the fir,bus is in possession and he is into loss because of this. Had the fir not been lodged then he would have provided with the monetary help. Now the aggrieved party is in dilemma because they have to shed approx a lac to get it reconstructed inspite of the fact that they are not at fault even a bit. What to do??