Airtel — wrongly data balance deducted

Address:

Jaipur, Rajasthan, 302018

In my airtel number i get 1GB data per day. At the mid night (12.00 AM) it should be 0MB uses but many times its showing used some MB's. That is depending on my uses if i stop the data connection before 12.00 AM and start after 12.00 AM then it is showing correct data uses. And if not then it will showing some data that is using around 12.00 AM.