Let me ask you one query. You have a postpaid data connection with monthly limit of 10gb. Bill generates on 4th Aug. You have exhausted the limit for this month, and hence switched off data connection. Now, u download a 2gb movie on 1st Aug, thinking it's a new month.
If your operator over charge you saying this 2gb adds to bill since the bill prepared on 4th, will you happily pay it???