National Highways Authority Of India [NHAI] — toll fee

Address:

Virudhunagar, Tamil Nadu, 626119

Hi,

Daily i am crossing nh7 etturvattam toll plaza.
I am just using only 8 kms from my native to cross that toll palza, but still they (Toll operators) asked to pay toll.
Daily i need to go sattur which is the nearest town for me.
For purchasing groceries, vegetables, fruits, sometimes hospitals, for all purpose i need to go there.
Sometimes there will be multiple time visit.
Now my question is, why i should pay toll for reaching nearest town.
I have local regd car as well.
Please explain how i can avoid paying daily toll fees.