Tamil Nadu Electricity Board [TNEB] — unable to add consumer number

Address:

Chennai, Tamil Nadu, 600117

Hi,
I am trying to add my tneb consumer number to my existing user account.
I tried with region number to without region number. But always get error like “invalid consumer no”.

I tried with all means ie i tried to created new registrations it failed.

I tried to pay through my icici banking account it also showed same error.

Now i am never able to pay online by adding my consumer number till now. My account is active and able to see bill details summary but only problem not able to add the consumer number to an account.

Please help my solve the problem.