National Highways Authority Of India [NHAI] — they are not accepting 50 ps. currency as it is still in circulation by rbi

At gogunda toll plaza on nh27 in rajasthan, they are not accepting 50 paisa coins against toll payment and misbehaving with the travelers. Date of travelling[protected]. Time @ 16:55 hrs.
Request to the authority to accept the running currency as well as instruct the staff to behave in proper manners.
Also request to avail the complain register on site (I. E. At every toll plaza).