Unused portion of acquisition land

Dear Sir/Madam,

    We bought a land in my village(Tiruppur DT, Tamilnadu) on Year of 2010. Around 30 years back for required on bridge construction Govt had acquired the land from previous owner. After that they built road inside the land. When we were survey while we bought came to know they built a road inside the land instead of acquired land. But previous owner cultivated, they have planted trees, the trees old about 30 years. 

I need some suggestion about this. Also I am not familier with Land acquisition laws.  Or we need to do some thing regading this

Thanks in Advance,

Prabhu