Tenancy case

Hello Sir, My father had a property from last 50 years which was brought from person by my grandmother. Now my grandmother died in 2008.In 1996 in that place we construct a building and gave lease to tenants. Actually it is a govt land we are paying property tax from 1996 upto till date. Now for own purpose we asked tenant to vacate and gave 6 months. Instead of vacating he file a Original suit in 2017 in junior civil judge court. In that case he obeyed that we are his owners. Again now he filed a R.C.C stating that we are not the owners of property and it is a govt land. He unknowingly took the lease from us and now he is asking that in his plaint that he is in a confusion whether he wants to pay to us (or) govt. He is willingly creating litigation. My question are we don't have any property papers but we are paying property tax in grandmother name from 1996. We do have any problem in court? And my question is we have rental agreement and shop rent 6500/- but he saying 1600 in his plaint, because to claim under Rent control laws. Can we get stay? In R.C.C suit not to proceed. Can we approach highcourt for any interim relief?