Land dispute

Sir I have purchased a plot in the year 1991 and have constructed a house in the year 2004 by taking all necessary permissions.After building a house a person came saying that the plot belongs to him. After seeing his documents i came to know that the person was cheated by the actual owner and the plot was double register but his documents were incorrect. So he sent me a legal notice for which i replied through my adv stating errors in his document and there was no reply from him since 2005 .now after 13 years i.e in 2017 April month he sold his plot and registered to another person and that person is going to my house and creating problem to tenants claiming that the plot belongs to him. I have constructed house 14 yrs back i.e in 2004 and was paying property taxes and electricity bills since then And the person who had purchased the plot recently has not sent me any notice till date since his purchase in 2017 ,Will the court institute suit if he files suit aftr 14yrs after my construction.pls advice