National Highways Authority Of India [NHAI] — Regarding irrelevant extra charges and misbehave on sasaram toll Bihar.

Respected sir
This is ravindra pati tripathi my relative mr. yogesh pandey booked tempo traveller to go to her sister marriage ceremony, at the toll sasaram bihar while going they charged 115 ₹ (as our van come under car/jeep/van category) but while returning same day they charged 185₹ (that is charge for minibus ) we objected this is van come under car/jeep/van category but they misbehaved and abused dint return our money.
Kindly look in to this matter so we get refund and assurance that this kind of activities would not be happen in future to any passenger.
Hoping for positive and prompt response.
Thank you.