National Highways Authority Of India [NHAI] — kognoli toll plaza monthly pass

My vehicle is registered at 23 km from kognoli toll plaza but my agriculture land is located at 4 km from kognoli toll plaza i have to pass toll plaza for agri reason daily. Kognoli toll plaza people's were not ready to accept agri 7/12 as proof for issuing monthly pass.
As we have to go to agri daily we request you to accept agri 7/12 also proof to issues monthly pass
Also we request you to clarify 20 km is air or circumferential distance or by road distance is to be considered to issue monthly pass