National Highways Authority Of India [NHAI] — high cost exceeding mrp

Address:

600099

I purchased 1litre water bottle - 35rs.
At highway nest mini
In tamilnadu, chennai, surapet toll both nearby.

When i asked shop keeper he said national highway govt only mentioned to sell all products at high cost.

Is it a democratic country where national highway opens shop and sells high price???

Moreover all products at these shops are greater than mrp amount.

Hence requesting concern department to address this issue at the earliest.