wrong bill generated

Location/place: vadodara

Name of company/service: airtel

my mobile number is 9662018965, i have 1GB free internet plan per month

while as per my bill my usage

on 11/6/2013:-39.78M
on 12/6/2013: 50.23MB
on 13/6/2013: 52.55MB
on 14/6/2013 : 17.7MB
on 15/6/2013 : 51.66MB
on 16/6/2013 : 44.16MB
on 17/6/2013 : 17.4MB
on 18/6/2013 : 18.11
on 19/6/2013 : 26.15 MB
on 20/6/2013 : 14.15MB
on 21/6/2013 : 68.85MB
on 22/6/2013: 115.3MB
on 23/6/2013: 132.4MB
on 24/6/2013: 174.6MB
on 25/6/2013: 472.98MB
on 26/6/2013: 7.02MB

usage of internet from date 22/6/2013 to 25/6/2013 is unusual as per my usage.