Mutation of Land is not being done by Block Level Employee

I am from Bihar. Recently we have purchased 1 beegha of Land from a party after paying a huge amount to them on my mother's name. But we are facing problem now as relative of that person (who sold it out to us) has captured the land illegally. To prevent us from any dispute we want to go for Mutation of Land first. For this, We filled an application in the Land and Revenue department on Block Level through RTPS. But my application is not being considered and rejected as the opposition party has bribed to the Middle level Employee who is involved in this. We are facing a lot of problem in this as there is no ground to reject the application, title of the land is completely in favour of us. I am doing a private job and living in Bangalore and my brother who is living in Bihar is facing too much difficulties and he has lost his faith in the judicial system. The Middle level employee is demanding huge amount to pass the paper and even if we pay money to him, it doesn't seem he will pass our application because he is very close to the opposition party as both are of same caste. It has been 08 months already and he is saying that application is still in the process even if it has crossed the maximum date to provide service. I had to go to my native for this only and stayed more than a month but the application could not be passed and processed, so many times I went to Block and talked to the Officer but everything was in vain. Nothing could be processed. As I am doing private job so it's not possible for me to sit at home for more than a month. My brother is so innocent and he is not having so much idea where to go and how to proceed. We had talked to Circle officer and Circle Incharge, too but they are also not helping as something is wrong there definitely. So what should we do in this condition and where should we go in this corrupt system so that we could get the mutation of our land??