Notice

My father died in 1973 leaving 4 acre of land. Total 7 heirs, 5 sisters and 2 brothers including me. Release deed was done by all 5 sisters in 1977. So after release deed ownership title remained in the name of my mother, my brother and me. Mother died in 2000, so after mother's death her name was omitted from the land title and the actual heirs now were me and my brother. Partition of land between me and my brother took place in the year 2005. After 39 years all 5 sisters have has send notice to me and my brother claiming their share from the land. the notice describes that they have not signed any release deed and if any they were not aware of any such law and in separate notice they have cried for mercy and made request to Mamlatdar / Circle Inspector / Collector that do not take time factor ( 39 years since the deed was. made ). As evidence I have VF6 ENTRY details, VF7 survey number details and VFBA khata details. On VF6 ENTYR DETAILS it clearly have mentioned that all 5 sisters have released their rights and their names have been removed in presence of witness ( more than 5 witness ) in talati / circle office of the village with their assurance, It also clearly mentioned that 135D notice was send to them by circle officer and confirming their assurance of all 5 sisters the deed was completed. Now after 39 years they are claiming their share, all experts can you please guide me with your expert opinion. Regards