Flip the coin. Atleast they told us, right? Atleast they did not go ahead and recover the value of the 30 units without our knowledge, right? Being prepaid, it would have been easy to just deduct without telling the masses, what with the way units change with different amounts. Yet again, when they installed the prepaid meters, they never said they were free units. They said the prepaid meters came with 30units so that you dont get disconnected when they removed the old meters. So, I see no wrong in what they have done. 30 units was power spent, it was a cost. They are just recovering it.
Luck is when Preparation meets Opportunity. ~ Lucius Annaeus Seneca