can somebody explain why E.F.F.C has not invaded into N.E.P.A issue

they are NO 1 419, higly rated advance fee frauders they make you pay
for what you are not supplied,

i strongly believe that the government is making money from the nation's black out
if not darkness should have been a thing of the past in this country

Why are you paying what you are not supplied if I may ask.
I know nepa estimate your monthly bill if they can't read it monthly, but they reconcile it periodically by taking the meter reading and correcting the estimate.

check your last meter reading as recorded on your current bill and compare it to the current reading on your meter, if there is much difference between the two then bring it to nepa's notice. they should be able to sort it out.

you are not supposed to pay for energy not used. but it is not really economical to read all the meters in Nigeria once every month. so the trade off is to use estimation and correct the estimate periodical.

You can also go for prepaid meter, depending on where you are.