National Highways Authority Of India [NHAI] — none of the fastag lines are working

We started our journey from nagarcoil to bangalore today morning between 5 o'clock and 6. We came across a couple of toll booths and none of the fastag lines are not working. When we asked about the situation they are very much arrogant and rude in behaviour. The answer is same in all the toll booths that fastag lines are disfunctional. How could all of them are disfunctional at once.