National Highways Authority Of India [NHAI] — Highly unethical practice at Mandva, Bharuch toll plaza

I had been stopped at 11:27 pm till 11:56 pm for fastag blacklist evennthough I had balance and still I did filled wallet with 500 Rs more at 11:29. They insisted me to pay double in cash saying fastag will take 20-30 or more mins to get active after recharge. I refused and they halt me with my two little kid n wife for about 30 min. Frustrated I told to fine me though I was not at fault. Suddenly toll admin rushed in hurry asking operator to release vehicle probably realising his misdeed. I doubt they halted me just to bribe and I got message of just 10 Rs charge as I was returning from same toll within 7-8 hours only. I doubt something unhealthy unethical practice by toll operators.
My vehicle GJ05JQ5367