National Highways Authority Of India [NHAI] — active 'fastag' was showing as 'blacklisted'.

Address:

24 ASHAPURAM STADIUM ROAD, BEHIND AK EYE HOSPITAL, Bareilly, Uttar Pradesh, 243122

I have a 'pnb fastag' on my vehicle no. Up25z 3004. Tag is active and have a balance of rs. 425.00. On 30/1/2020, i crossed through 'deoria toll plaza' at kashipur - sitarganj highway (Nh 74) through automatic gate and an amount of rs. 75.00 was deducted. But while returning on 2/2/2020 the gate didn't opened, and the staff told that your card is blacklisted, may be due to low balance. I showed the active status of my 'tag' on the pnb fastag website, where it was showing the status as 'active' and balance as rs. 425.00 in addition to the 'security amount' of rs. 200.00 also.
I failed to understand, why i was made to pay cash, when i had an active fastag'. I paid cash to avoid further in convenience to other fellow motorists, who were in a long queue.
Principly i would have been allowed to pass the plaza, when there is a system problem.