National Highways Authority Of India [NHAI] — Toll gate charges reg

I returned back from Thoothukudi to Tirunelveli today. Around 4 pm I crossed the Vagaikulam toll gate. I have already installed fast track for my vehicle. I had enough money too in the account. Bu the toll gate authorities told me that a minimum of 300 rupees has to be maintained in the account n charged me with 65 rupees. When I checked with my account 30 rupees has been debited. I have been overcharged. Kindly do the needful.