National Highways Authority Of India [NHAI] — not exempting central gst supdt when on official tour

The nhai toll way o[censored]lundurpet expressways in vikravandi toll is not allowing the supdt cgst, if on official tour.
the cadre is a central govt. gazatted one and there no provision of official vehicle, we travel to chennai officially and at times in private cars as there is no provision of official car to this cadre.
when all the other expressways are allowing only this vikrawandi is not allowing the exemption, even if the officer is showing the official ID himself.
it appears that only this booth is demanding toll fee for official visit of the cgst officers when they travel. other tolls in the city viz. chennai and enroute to chennai allow.
kindly instruct them to allow as our claim is genuine.