Wrong case filed fr getting property according to Islamic shariat

Dear Sir, My step grandmother filed case against my father and my real uncle to get 50% part in property given by my grandfather.And the land which they are demanding share in registered in mamlatdar office since 1967 in name of my father and my uncle and we are also having will from my grandfather saying "i have given already given respective share to both my wife to avoid conflict in future".our land is no19 and 4 which is registered since 1967 in our name and there land number is 67 which according to my step grandmother is mehar in marriage from my grandfather in 1958 and they have claim this in court as well but according to the evidence we have receive her mehar was given 127.50 RS in 1958 and not the land. we have win our 1 court case and judgement was in ou favour with conclusion that on 18 years of time period they cannot claim the property and in court also they haven't provide any evidence. and in 2nd court also we havent receive any evidence from there side but since 3 years case is still pending.By providing 122 doc from our side they are demanding more and more papers but not giving judgement.they have purchase our vakil also and he is also no helping us and even jugde is behaving weird. kindly advise