National Highways Authority Of India [NHAI] — Unauthorised collection at toll plaza

Hi,
There is unauthorised money collection going on at the Ludhwai toll plaza near Bharatpur. I crossed the toll on 20th Jan at around 5:40 PM, the toll official asked me for 15 rupees. I told him that it will be automatically deducted through fasttag but he informed that the fasttag is not working. I paid him the money. On the next morning 21st Jan at 7:30 AM, I received the SMS that a toll of Rs. 20 is deducted from my account. Here is my concern:

1. The toll official at Ludhwai toll plaza has cheated and needs to be punished. It's not about Rs 15, it's about ethics and honesty.
2. Why I am receiving sms after 14 hrs. I paid toll on other plazas also, had same experience, received SMS after 3-4 hrs?
3. What's the challenge plazas are facing in sending real time SMS's?
4. Why government wants to make fasttag mendatory when the technology is not good enough and officials are corrupt?