Construction on agriculture patta .

Sir, My name is Kobir Sumon , I am an Advocate by profession , My question is : My client has a 8.33 decimal agricultur patta land , he cultivating there , but now he has been constructed a building uopn the said land , he did not know about agri patta , and he has no knowledge about it . the agri patta was name on his father . but inherently after death of his father the record has been gone to him. actually my client has 4 brothers more and there is very much tough to cultivate on said land together . Now he is raise a building taking a private loan for huge interest . he wanted run his family with rent . the problem is that BL&LRO is involved with some powerful politician & promoter to prevent the construction of the building and try to annul the agri patta with his own interest . Now I am filed a civil Title suit before the jurisdiction Ld. Civil judge Jr. Dv. Court at Lalbagh , Murshidabad , West Bengal . and also filed a Writ petition before the Ld. High court at Calcutta . what am I doing in this Peculiar situation or circumstances . I am afraid .