National Highways Authority Of India [NHAI] — Toll charging more money

I have traveled in my car on 05/06/2022 via paranur toll plaza to Puthucherry and returned same evening.
But this particular toll changes the same amount for up and down . It’s not only my vehicle, many fellow travelers also had the same complaints.
Please look into this anomaly.
Toll plaza : Paranur ( Chengalpattu)
Time for upwards journey:02:37:33 Amount Rs.60/-
Downwards on the same date :07:12:57 Amount Rs.60/-
Car number:TN19 AR 1302
Please do the needful.
Natarajan [protected]@ Yahoo.com [protected]