You may have to wait till you get the bill for Feb 2012.
Better take a print out full page
Give an application to A.O(TR)pointing the mistake. enclosing above.
Get a receipt in your copy.
Watch for more error recordings. next 2 or three days.
Unlikely the meter readings can be amended/reset manually.
send a complaint to ONLINE All India site. for record purposes. http://mis.bsnl.co.in/pgs/internet/pgwebregn.asp
3. Appears the NU free period at start starts with a 30 minute block.
require more checking for errors.