National Highways Authority Of India [NHAI] — illegal toll recovered from central govt, officer income tax department

Address:

Road no-4, Near -Deepshikha,Vishwanath nagar, Begusarai, Begusarai, Bihar, 851101

It is informed that i am a central govt officer of income tax department holding the charge of begusarai. For my head office work i have to visit patna more karen. For the last 12 years of my regular visit to patna this is first time patna toll tax authority prevented my departmental vehicle having departmental name board on it for payment of tax. Upon production of departmenal id card too they remained asamany for payment of toll tax.
Talked to manager... Some sanjeev... But of no avail. He also said we r boond to take tax.
Please look into the matter and furnish a reply to this effect as to whether govt vehicle having bharat sarkar, aaykar vibhag, begusarai board on it and receipt of officer's id is exempted or not.
Thanks.